The following recommendations apply to all Golden Artist Colors products: color, gel, medium, gesso, etc. Store paints between 50 and 80 degrees Fahrenheit. These are ideal temperatures that should limit paint drying out, thickening, losing its smooth consistency and potentially becoming unworkable. Store full jars or minimize head space by scraping down the sides of the container, misting the paint surface lightly with distilled water and lining with plastic thereby reducing water evaporation.