Solarez UV Cure Epoxy Repair Putty with Sanding Block UV Cure Epoxy is a mixture of clear, high strength, fiber reinforced epoxy resin and an amazing solar activated catalyst. There is no mixing required, just use it right from the tube. It gels in 5 seconds, curing in 3 minutes - but ONLY when exposed to sunlight. No mixing necessary. UV curing assures complete hardening. Provides complete cross-linking Remarkably tough and resilient Contains urethane that keep from yellowing Eco-friendly ZERO vapors, non-flammable. Comes with 60/240 grit sand pad in a crush-proof watertight plastic capsule.