These Artists' Acrylic Mediums meet the highest standards, and when used to alter paint characteristics such as flow, transparency, gloss, and drying time, allow you to create a virtually endless array of creative effects.
Acrylic Retarder — Extend the working time of your acrylic paints with Grumbacher Artists' Acrylic Retarder. This slow-drying additive may be mixed directly into acrylic colors or with other painting mediums in ratios of up to 30% to volume. For the longest drying time, use the maximum percentage of retarder to color or medium.
® Grumbacher is a registered trademark of Chartpak.