There’s nothing quite like a free radical polymerization reaction! The green nail polish in this video is a UV gel polish. And if you’ve ever wondered how gel polish works, its all about polymerization. In this case, the reaction is started by photoinitiators in the polish, which absorb UV light, which converts them into free radicals that cause the acrylic monomers (often methacrylates) to cross-link and bond, becoming a super durable plastic resin that even the toughest solvents have a difficu