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on 4/24/21The military grade topcoat holds up well to UV rays but like all indoor epoxies if you leave your door open all day long every weekend it will eventually yellow.
For normal UV exposure Yellowing is not an issue since the topcoat is a urethane and UV rated but it is not outdoor rated therefore the UV exposure needs to be limited.
For long frequent or continuous UV exposure you need an outdoor rated epoxy such as our Ultra Fast epoxy.