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Grumbacher Professional Oil Mediums

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Designed to achieve various techniques!

Grumbacher painting mediums guarantee that paint attributes are not compromised but enhanced. These mediums thicken or thin without harming the color's adhesive, binding, or film-forming qualities. Myriad effects such as increased flow and open time or rapid drying of color are all possible. Grumbacher has selected oils, resins, and solvents to guard against yellowing and cracking, and the ingredients have proven themselves over many generations of use.

Key Features:
  • Accelerate or slow drying time
  • Increases gloss & translucency
  • Outstanding working properties
  • For information click on yellow technote icon
  • Made in the USA
Perfect For:
  • Traditional or alkyd oil paints
  • Enhancing paint characteristics
  • Dry transparent or translucent
  • Maintaining consistency
  • Preserving gloss

Alkyd Painting Medium: Speeds drying time and gives a nice painterly consistency to alkyd and oil colors. Alkyd Medium enhances transparency and clarity of the paint. The color appears rich and intense.

Cobalt Drier: The recommended drier for fine arts oil paintings. Add to oil painting medium in drops as opposed to adding directly to oil paint. Cobalt Drier is a powerful additive for oil paints and should be used sparingly. Test medium before applying it to an oil painting. Overuse may cause cracking of paint film when drying.

Grumbacher Professional Oil Mediums
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This item is subject to Shipping Restrictions due to regulations by certain states regarding VOCs. Jerry's is not permitted to ship this item to California, Connecticut, Delaware, Maryland, New Hampshire, Rhode Island, Colorado, New York, Ohio, or Utah. Jerry's in an effort to comply with state regulations we apologize for any inconvenience.

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Product Notes:
  • Hazardous Hazardous - This item is considered flammable or hazardous. These type of items are not available for rush or air service.
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Designed to achieve various techniques!

Grumbacher painting mediums guarantee that paint attributes are not compromised but enhanced. These mediums thicken or thin without harming the color's adhesive, binding, or film-forming qualities. Myriad effects such as increased flow and open time or rapid drying of color are all possible. Grumbacher has selected oils, resins, and solvents to guard against yellowing and cracking, and the ingredients have proven themselves over many generations of use.

Key Features:
  • Accelerate or slow drying time
  • Increases gloss & translucency
  • Outstanding working properties
  • Made in the USA
  • see videos and demo’s
Perfect For:
  • Traditional or alkyd oil paints
  • Enhancing paint characteristics
  • Dry transparent or translucent
  • Maintaining consistency
  • Preserving gloss

Alkyd Painting Medium: Speeds drying time and gives a nice painterly consistency to alkyd and oil colors. Alkyd Medium enhances transparency and clarity of the paint. The color appears rich and intense.

Cobalt Drier: The recommended drier for fine arts oil paintings. Add to oil painting medium in drops as opposed to adding directly to oil paint. Cobalt Drier is a powerful additive for oil paints and should be used sparingly. Test medium before applying it to an oil painting. Overuse may cause cracking of paint film when drying.

Copal Painting Medium: has a resinous consistency perfect for glazing and wet-on-wet techniques. Copal painting medium is an oil paint additive that speeds drying time. This medium increases paint flow and imparts a high gloss and hardness when dried. Copal painting medium may cause yellowing or darkening of colors over long periods. Only dilute with turpentine or Grumtine as petroleum-based solvents, and odorless thinners are not compatible with this product.

Damar Varnish: A final varnish for oil painting that imparts a high gloss finish. Processed with pure gum damar, Damar Varnish protects oil paintings from dirt and scuffing.

Japan Drier: A solid alkyd resin-based liquid drier for artists' oil colors. Japan Drier is used primarily for oil gilding. It is an alkali based drier that may cause yellowing or darkening of colors over time.

Odorless Thinner: is a clear, organic solvent for thinning oil colors, cleaning brushes, and painting accessories.

Oil Painting Medium No. 1: Use when a matte finish is desired, especially on absorbent gesso grounds. Made from poppy seed oil, copaiba, balsam, and solvent.

Oil Painting Medium No. 2: For use with oils to retard drying time. It contains poppy seed oil, mastic resin, alkyd resin, and grumtine.

Oil Painting Medium No. 3: Accelerates drying time. It contains copaiba, balsam, stand oil, mastic resin, alkyd resin, cobalt, and manganese driers.

Pale Drying Oil: Accelerates drying time of oil colors. Consists of linseed oil and manganese drier.

Poppy Seed Oil: An excellent quality, slow drying, purified oil that retards drying time. It provides superior color retention and resistance to yellowing.

PreTested Linseed Oil: Linseed oil has several uses in oil painting. It can be used as a paint binder ingredient when mixing colors from powdered pigments, in oil painting medium recipes, and added directly to oil paints to make colors glossy and fluid. This oil is made from the finest quality purified alkali-refined linseed oil.

Retouch Varnish: For brightening uneven areas of oil paintings. An excellent varnish for protecting pictures until the final varnishing.

Stand Oil: A flexible, very heavy-bodied purified oil for use in preparing mediums—excellent resistance to yellowing.

Sun-Thickened Linseed Oil: Sun-thickened linseed oil is heavier in body and can be appplied directly to paint or used in glaze mediums, clear varnishes and emulsions. It is an extremely flexible medium derived from purified oil and can be pre-diluted with turpentine, Grumtine or Pre-tested odorless thinner. The linseed oil lends an enamel-like quality to oil color.

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Grumbacher Pre-Tested Pale Drying Oil, 2.5 oz Bottle
80667 80667
PreTested Pale Drying Oil PreTested Pale Drying Oil
2.5 oz 2.5 oz
Bottle Bottle
14.450000 $14.45
8.430000 $8.43
1 In Stock
Product Badge:
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  • Tech Notes: Click This Icon To See Tech Notes

    This oil paint additive speeds drying time increases flow and gloss and reduces the consistency of oil colors straight from the tube. Excess use can cause poor flexibility and yellowing and therefore it is recommended for artisan painting versus fine art application. Use sparingly with any oil painting solvents or mediums. Cleans up with mild solvents. Made in the USA.

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Grumbacher Pre-Tested Japan Drier, 2.5 oz Bottle
80668 80668
PreTested Japan Drier PreTested Japan Drier
2.5 oz 2.5 oz
Bottle Bottle
16.500000 $16.50
9.600000 $9.60
1 In Stock
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    Japan Drier is used primarily for oil guilding. It is an alkali based drier that may cause yellowing or darkening of colors over time so it is recommended for sign painting, woodworking, and crafting versus fine art applications. Apply Japan Drier to an appropriate surface and allow to dry to a high tack before applying gold or silver leaf; smooth then burnish. Made in the USA.

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Grumbacher Pre-Tested Linseed Oil, 2.5 oz Bottle
80669 80669
PreTested Linseed Oil PreTested Linseed Oil
2.5 oz 2.5 oz
Bottle Bottle
12.000000 $12.00
7.040000 $7.04
1 In Stock
Product Badge:
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    Linseed oil has a number of uses in oil painting. It can be used as a paint binder ingredient when mixing colors from powdered pigments, in oil painting medium recipes, and added directly to oil paints to make colors glossy and fluid. Made from the finest quality purified alkali-refined linseed oil. Linseed oil can be pre-diluted with Turpentine, Grumtine, or Pre-tested Odorless Paint Thinner. Made in the USA.

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Grumbacher Pre-Tested Poppy Seed Oil, 2.5 oz Bottle
80671 80671
PreTested Poppy Seed Oil PreTested Poppy Seed Oil
2.5 oz 2.5 oz
Bottle Bottle
21.050000 $21.05
12.390000 $12.39
1 In Stock
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  • Tech Notes: Click This Icon To See Tech Notes

    Poppyseed oil is an oil paint additive similar in application to linseed oil. Poppyseed oil is especially good for use with pale colors as it is excellent at color retention and is often used for alla prima techniques. Unlike linseed oil, it is not for use with multiple layer techniques. It may be diluted with Turpentine, Grumtine and Pre-tested Odorless Thinner. Made in the USA.

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Grumbacher Pre-Tested Stand Oil, 2.5 oz Bottle
80672 80672
PreTested Stand Oil PreTested Stand Oil
2.5 oz 2.5 oz
Bottle Bottle
15.550000 $15.55
8.980000 $8.98
1 In Stock
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    Stand oil is a high viscosity oil paint additive that eliminates brush marks and creates an enamel-like finish. It is a heavy, polymerized linseed oil that slows drying while improving the fluidity of oil paint and creates a flexible paint film when dry. Stand oil can be added directly to oil paints, to painting mediums and glazes and in varnishes. Made in the USA.

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Grumbacher Pre-Tested Sun-Thickened Linseed Oil, 2.5 oz Bottle
80673 80673
PreTested Sun-Thickened Linseed Oil PreTested Sun-Thickened Linseed Oil
2.5 oz 2.5 oz
Bottle Bottle
18.650000 $18.65
10.840000 $10.84
0 Out Of Stock
(expected: 12/27/2023)
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  • Tech Notes: Click This Icon To See Tech Notes

    Sun-thickened linseed oil works similarly to traditional linseed oil in terms of adding gloss and fluidity to oil paints. Sun-thickened linseed oil is heavier in body and can be applied directly to paint or used in glaze mediums, clear varnishes, and emulsions. It is an extremely flexible medium derived from purified oil and can be pre-diluted with Turpentine, Grumtine or Pre-tested odorless thinner. Made in the USA.

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Grumbacher Pre-Tested Oil Painting Medium No. 1, 2.5 oz Bottle
80674 80674
PreTested Oil Painting Medium No. 1 PreTested Oil Painting Medium No. 1
2.5 oz 2.5 oz
Bottle Bottle
16.850000 $16.85
9.810000 $9.81
1 In Stock
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    This oil painting medium is ideal for oil painting work where a matte finish is desired. Ideal for use in underpaintings, on absorbant gesso and for mural work. Add directly to paint in small amounts. Only dilute with Turpentine or Grumtine – petroleum based solvents and odorless paint thinners are not compatible with this product. Use in a well-ventilated area. Made in the USA.

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Grumbacher Pre-Tested Oil Painting Medium No. 2, 2.5 oz Bottle
80675 80675
PreTested Oil Painting Medium No. 2 PreTested Oil Painting Medium No. 2
2.5 oz 2.5 oz
Bottle Bottle
21.150000 $21.15
12.380000 $12.38
1 In Stock
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    This oil painting medium is ideal for use when one wishes to slow drying time and is especially useful for wet-in-wet techniques. It imparts a high gloss to when dry. Add directly to oil paint in small amounts. Only dilute with Turpentine or Grumtine – petroleum based solvents and odorless paint thinners are not compatible with this product. Use in a well-ventilated area. Made in the USA.

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Grumbacher Pre-Tested Oil Painting Medium No. 3, 2.5 oz Bottle
80676 80676
PreTested Oil Painting Medium No. 3 PreTested Oil Painting Medium No. 3
2.5 oz 2.5 oz
Bottle Bottle
25.350000 $25.35
14.760000 $14.76
1 In Stock
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  • Tech Notes: Click This Icon To See Tech Notes

    This oil painting medium is ideal for speeding drying time, especially for glazing. It imparts a high gloss when dry. Add directly to oil paint in small amounts. Only dilute with Turpentine or Grumtine – petroleum based solvents and odorless paint thinners are not compatible with this product. Use in a well-ventilated area. Made in the USA.

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Grumbacher Pre-Tested Oil Painting Restorer, 2.5 oz Bottle
80677 80677
PreTested Oil Painting Restorer PreTested Oil Painting Restorer
2.5 oz 2.5 oz
Bottle Bottle
18.650000 $18.65
10.840000 $10.84
1 In Stock
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    A surface cleaner for completed and dried oil paintings, Oil Painting Restorer revives, refreshes and conditions a painting by removing surface soil. Apply to a lint-free cloth to gently clean the surface of a work while constantly turning the cloth so as not to rub soil into the painting. Use with care around highly textured surfaces. Oil painting restorer may be removed with a clean cloth dampened with turpentine. Made in the USA.

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Grumbacher Pre-Tested Alkyd Painting Medium, 2.5 oz Bottle
80678 80678
PreTested Alkyd Painting Medium PreTested Alkyd Painting Medium
2.5 oz 2.5 oz
Bottle Bottle
15.100000 $15.10
8.750000 $8.75
1 In Stock
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Grumbacher Pre-Tested Copal Painting Medium, 2.5 oz Bottle
80679 80679
PreTested Copal Painting Medium PreTested Copal Painting Medium
2.5 oz 2.5 oz
Bottle Bottle
16.250000 $16.25
9.470000 $9.47
1 In Stock
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  • Tech Notes: Click This Icon To See Tech Notes

    Copal painting medium is an oil paint additive that speeds drying time. This medium increases paint flow and imparts a high gloss and hardness when dried. Best used for artisan painting versus fine art application, Copal painting medium may cause yellowing or darkening of colors over long periods of time. Only dilute with Turpentine or Grumtine as petroleum based solvents and odorless thinners are not compatible with this product. Made in the USA.

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Grumbacher Pre-Tested Cobalt Drier, 2.5 oz Bottle
80681 80681
PreTested Cobalt Drier PreTested Cobalt Drier
2.5 oz 2.5 oz
Bottle Bottle
22.400000 $22.40
13.080000 $13.08
1 In Stock
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  • Tech Notes: Click This Icon To See Tech Notes

    As its name implies, it speeds the drying time of oil colors. Add to add to an oil painting medium in drops as opposed to adding directly to oil paint. Cobalt Drier is an extremely strong additive for oil paints and should be used sparingly. Test medium before applying it to an oil painting. Overuse may cause cracking of paint film when drying. Made in the USA.

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Grumbacher Pre-Tested Picture Varnish, 2.5 oz Bottle
80682 80682
PreTested Picture Varnish PreTested Picture Varnish
2.5 oz 2.5 oz
Bottle Bottle
16.500000 $16.50
10.130000 $10.13
1 In Stock
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    Grumbacher Picture Varnish is a final varnish that produces a uniform satin finish for oil and acrylic paintings. It is processed with acrylic resin and protects from atmospheric impurities. This brush-on varnish should be applied to finished works that have dried for at least 6 months for oil paintings, and 5 days for acrylics. Test the varnish and your application method before applying to finished artwork. Apply in even strokes left to right. Let dry before turning work 90 degrees before re-applying. Can be removed with paint thinner or other mild solvents. Not for use in oil painting medium preparation. Made in the USA.

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Grumbacher Pre-Tested Retouch Varnish, 2.5 oz Bottle
80683 80683
PreTested Retouch Varnish PreTested Retouch Varnish
2.5 oz 2.5 oz
Bottle Bottle
15.850000 $15.85
9.250000 $9.25
1 In Stock
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    A working varnish for oil painting, Retouch Varnish evens out gloss of unfinished work and revives dry/matte areas. This aids in accurate color comparison. Use in very thin layers. Varnish must be dry before over-painting and is not intended as a final varnish. Made in the USA.

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Grumbacher Pre-Tested Damar Varnish, 2.5 oz Bottle
80684 80684
PreTested Damar Varnish PreTested Damar Varnish
2.5 oz 2.5 oz
Bottle Bottle
15.100000 $15.10
8.750000 $8.75
1 In Stock
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    A final varnish for oil painting that imparts a high gloss finish. Processed with pure gum damar, Damar Varnish protects oil paintings from dirt and scuffing. Damar varnish may also be used in oil medium preparation. Wait at least 6 months after the painting has dried before applying this as a final varnish. Test before applying to work. Apply varnish in slow, even strokes left to right. Let dry before turning work 90 degrees before re-applying. Varnish can be removed with paint thinner or other mild solvents. Made in the USA.

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Grumbacher Pre-Tested Matte Varnish, 2.5 oz Bottle
80686 80686
PreTested Matte Varnish PreTested Matte Varnish
2.5 oz 2.5 oz
Bottle Bottle
17.800000 $17.80
10.280000 $10.28
1 In Stock
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    A final oil painting varnish for pale works and smooth paintings. Matte varnish is processed with damar varnish and bees wax and protects from atmospheric impurities. Wait at least 6 months after the painting has dried before applying this as a final varnish. Test before applying to work. Before use, heat in warm water until clear. Apply varnish in slow, even strokes left to right. Let dry before turning work 90 degrees before re-applying. Varnish can be removed with paint thinner or other mild solvents. Made in the USA.

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Grumbacher Pre-Tested Grumtine, 2.5 oz Bottle
80688 80688
PreTested Grumtine PreTested Grumtine
2.5 oz 2.5 oz
Bottle Bottle
15.100000 $15.10
8.750000 $8.75
1 In Stock
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    Grumtine is an oil painting solvent that is a slightly stronger alternative to turpentine. It is derived from citrus peel and has a cirtus aroma. Grumtine can be used for cleaning oil painting equipment and for use in all applications calling for turpentine. Made in the USA.

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Grumbacher Pre-Tested Turpentine, 2.5 oz Bottle
80694 80694
PreTested Turpentine PreTested Turpentine
2.5 oz 2.5 oz
Bottle Bottle
12.000000 $12.00
7.040000 $7.04
1 In Stock
Product Badge:
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    A traditional solvent for oil painting, turpentine improves paint flow by thinning oils. The rapid evaporation of turpentine promotes polymerization of oil paint and mediums, thus speeding dry time. Can be applied directly to oil paint or used in painting and glazing mediums. Turpentine may also be used to clean painting equipment. Keep stored in a tightly sealed container and use in a well-ventilated area. Made in the USA.
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Grumbacher Pre-Tested Linseed Oil, 8 oz Bottle
80670 80670
PreTested Linseed Oil PreTested Linseed Oil
8 oz 8 oz
Bottle Bottle
23.750000 $23.75
14.550000 $14.55
1 In Stock
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    Linseed oil has a number of uses in oil painting. It can be used as a paint binder ingredient when mixing colors from powdered pigments, in oil painting medium recipes, and added directly to oil paints to make colors glossy and fluid. Made from the finest quality purified alkali-refined linseed oil. Linseed oil can be pre-diluted with Turpentine, Grumtine, or Pre-tested Odorless Paint Thinner. Made in the USA.

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Grumbacher Pre-Tested Copal Painting Medium, 8 oz Bottle
80680 80680
PreTested Copal Painting Medium PreTested Copal Painting Medium
8 oz 8 oz
Bottle Bottle
38.150000 $38.15
22.230000 $22.23
1 In Stock
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    Copal painting medium is an oil paint additive that speeds drying time. This medium increases paint flow and imparts a high gloss and hardness when dried. Best used for artisan painting versus fine art application, Copal painting medium may cause yellowing or darkening of colors over long periods of time. Only dilute with Turpentine or Grumtine as petroleum based solvents and odorless thinners are not compatible with this product. Made in the USA.

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Grumbacher Pre-Tested Odorless Thinner, 8 oz Bottle
80691 80691
PreTested Odorless Thinner PreTested Odorless Thinner
8 oz 8 oz
Bottle Bottle
24.700000 $24.70
14.370000 $14.37
1 In Stock
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    A crystal clear, mild organic solvent for thinning oil colors and some varnishes, cleans brushes and painting tools without the heavy smell of turpentine or other paint thinners. Keep stored in a tightly sealed container and use in a well-ventilated area. Made in the USA.

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Grumbacher Pre-Tested Turpentine, 8 oz Bottle
80695 80695
PreTested Turpentine PreTested Turpentine
8 oz 8 oz
Bottle Bottle
24.700000 $24.70
14.370000 $14.37
1 In Stock
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    A traditional solvent for oil painting, turpentine improves paint flow by thinning oils. The rapid evaporation of turpentine promotes polymerization of oil paint and mediums, thus speeding dry time. Can be applied directly to oil paint or used in painting and glazing mediums. Turpentine may also be used to clean painting equipment. Keep stored in a tightly sealed container and use in a well-ventilated area. Made in the USA.

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Grumbacher Pre-Tested MG Underpainting White, 150 ml Tube
02041G 02041G
MG Underpainting White MG Underpainting White
150 ml 150 ml
Tube Tube
37.800000 $37.80
22.670000 $22.67
1 In Stock
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    Grumbacher Pre-Tested MG Underpainting White150 ml Tube


    This permanent, fast-drying Titanium White oil paint is designed for use in underpainting or in wet-on-wet (alla prima) painting. Specifically formulated to create a lean, dry paint film, MG Underpainting White has enough tooth to readily accept glazes. Other uses include creating surface textures and impasto techniques. In normal applications, MG Underpainting White dries to the touch in 4 to 6 hours and may be painted over immediately.


    • 150 ml Tube
    • Accelerate or slow drying time
    • Increases gloss and translucency
    • Outstanding working properties
    • Made in the USA
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Grumbacher Pre-Tested ZEC Gel, 150 ml Tube
02043G 02043G
ZEC Gel ZEC Gel
150 ml 150 ml
Tube Tube
40.250000 $40.25
23.570000 $23.57
1 In Stock
Product Badge:
  • Hazardous Hazardous - This item is considered flammable or hazardous. These type of items are not available for rush or air service.
  • LPP Lowest Price - This item is already at the Best Lowest Price Possible and no further discounts or coupons can be applied.
  • Tech Notes: Click This Icon To See Tech Notes
    COLORLESS QUICK DRYING MEDIUM ADDED TO OIL COLORS TO ACCELERATE DRYING TIME PAINTINGS DRY TO THE TOUCH 4-6 HOURS MAINTAINS THE CONSISTENCY AND HUE HOLDS DESIRED TEXTURE
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