Works directly out of the container 100% UV Activated (Sets as fast as 1 minute in the sun!) Zero catalyst required (Never mix too hot, or too cold; always perfect) Almost zero waste (NO MORE "STUCK" BRUSHES!) Excellent saturation Work inside the shop and it never sets up until you bring it into the sunshine! No lingering odor once fully cured. UV (Sunshine) Activated Polyester Resin (can be used indoors with a black light (385-410nm)