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:
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.
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.
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.
See our Product Information Sheets for OPEN Acrylic Colors and OPEN Mediums for additional information:
OPEN Thinner may be used as a thin bodied retarder with faster drying GOLDEN Acrylic paints. It should not be used in thick applications of more than 1/16".