Will my epoxy project yellow over time?

All epoxies yellow over time due to the ultraviolet component of natural daylight. To combat this, we often formulate our products with UV stabilizers, especially those that are used as transparent or translucent systems. UV stabilizers absorb UV light and prevent damage to the resin. Eventually, the stabilizers will lose their effectiveness. Adding metallic or liquid pigments to epoxy will help it resist yellowing better than if it is left transparent. Completed projects should not be kept outdoors.