Why UV Epoxy Keeps Curing in the Dark
Daniel asked why epoxy can't cure itself, and whether light can replace the hardener. The answer runs through a three-membered ring under strain, a hardener ratio where a few percent decides the repair, and a photoinitiator that generates acid instead of radicals. That last detail is why true UV epoxy cures in shadows no lamp can reach — and keeps curing for a day after the light is off. We cover the basic two-part chemistry first, then dig into cationic curing, the craft-store resin mix-up, oxygen inhibition, and the datasheet numbers that show a UV-cured joint nearly tripling in strength…
The skinny
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