Extra Solids Acrylic Urethane Clearcoat Activators are specifically designed for high productivity shops using Transtar Finish-Tec Clearcoats. Activators are suitable for use in clearcoat applications over single stage topcoats and for base/clear applications (except lacquers). #6891/6894, Overall Activator is designed for use in temperatures between 75 - 90F (24 - 32C) or for large jobs which require longer open times.