With this medium you can thicken the paint to work with cones, for example
Using Gloss Heavy Gel
Heavy Gel Medium Gloss - Liquitex – Joy Color Art®
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Brand quality from Liquitex Increases flow, transparency and sticking acrylic colours Available in Muli sizes Can be mixed with acrylic colors or dry painted Liquitex-gesso. This seal surface protector hardens and provides a tooth surface to paint on. The product gives an opaque matte white finish, is flexible, and water resistant when dry. For use with oil, acrylic and other painting mediums. Apply to a raw canvas; hardboard, paper, wood and other porous surfaces.
Liquitex Gloss Gel Medium - 8 oz.
Liquitex Professional Gloss Gel Medium, 237ml (8-oz) : Everything Else
Nullify Imported Very dense with high surface drag for a stiff, oil-paint-like feel Lightweight, non-toxic and dries to a water-resistant,
Liquitex Professional Gloss Super Heavy Gel Medium, 473ml (16-oz)
Professional Gloss Super Heavy Gel - Acrylic Mediums
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Using Gloss Heavy Gel
Liquitex Professional Gloss Super Heavy Gel Medium, 946ml (32-oz) : Everything Else