This might surprise you, but epoxy resin is not suitable for outdoor use under normal circumstances. We already talked about how the sun’s UV rays will cause yellowing in most epoxy products. If the epoxy is left in the sun for a long time, even harsher problems can occur. As it yellows, the epoxy will turn brittle and eventually begin to peel away.
That’s why you should always go with a UV-resistant product when using epoxy resin outdoors. This stuff doesn’t tend to be cheap, so it makes no sense to waste your money on something that will not last. Look for products with UV stabilizers and HALS, as these are the best solutions. Some manufacturers will add dyes to their epoxy in an attempt to reduce light penetration and thus reduce light degradation. However, most people prefer to use clear epoxy, so this isn’t a great solution.
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