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Golden OPEN Thinner


OPEN Thinner contains no binders and is used to thin paint mixes without altering open time, or to maintain and adjust workability on palettes without water mists and moisturizing palettes.

Note: Packaging design may vary.

Golden OPEN Thinner - 30 ml 30 ml 250
Golden OPEN Thinner - 118 ml 118 ml 490


GOLDEN OPEN Thinner is a water-based additive designed to thin the consistency of OPEN Acrylics without altering open time, as well as maintain and adjust the workability of colors on the palette. OPEN Thinner can also function as a thin-bodied retarder when used with GOLDEN Heavy Body or Fluid Acrylics. OPEN Thinner contains no binders, does not form a film, and should never be used alone.


Add sparingly to acrylic paints, starting at approximately 10 parts paint to 1 part OPEN Thinner.  Maximum addition is 3 parts paint to 1 part Thinner.

OPEN Thinner should not be used in thick applications. Applications of more than 1/16” may result in:

    • Excessively long drying periods
    • Persistently soft, higher tack feel
    • Translucent layers that remain cloudy

Use with GOLDEN OPEN Acrylics

Maintaining Working Properties
As OPEN Acrylics dry, water and other volatile additives evaporate causing the paints to become stiffer with increased brush drag.  Adding small amounts of OPEN Thinner replenishes the volatile components, allowing the artist to maintain a long working time and to slow the paint from drying on the palette. It can be difficult to accurately gauge the evaporation rate of volatile ingredients during painting, so add sparingly.

Thinning OPEN Acrylics
OPEN Thinner can be used to lower the viscosity of OPEN Acrylics while preserving maximum working time. Water can also be used for this purpose, and will actually reduce the viscosity of the paint even faster, although it will not preserve the extended open time.

Use with moderation. Over-additions of water or OPEN Thinner can result in a weak, underbound film.

Rewetting of OPEN Acrylic Colors
OPEN Acrylics can be reactivated for many hours after initial application, allowing for extended periods when multiple layers can be worked and blended into each other. To reopen films before they have fully ‘locked down’i, apply OPEN Thinner directly to the paint film, brushing back and forth until the paint has been reconstituted. Even after OPEN paint films have initially set up and become tacky, they can still be reactivated, although more extended or vigorous brushing might be required.