It's safe but best for dry enviroments. Personally I'm not a fan of how it can get sticky and I'm not sure how well it holds in humid enviroments. However I THINK they have outdoor variants now but I recall the reviews were not great.
For a bp enclosure you're probably better off with an acrylic sealant such as Minwax Polycrylic protective finish. Plus it can come in a spray can version
This is the one I used
https://www.amazon.com/dp/B000C02AO2...=2ZR8XGI89JMTN
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