Since it came out so beautifully, I'm sure you want it to last a long time!
A lot of epoxies, even those made for boat building, are not very UV stable and must be coated in something to protect from UV. Even those labeled "UV stable" usually hold up better if coated, versus not. Might be worth checking on that.
The usual coating for protection would be spar varnish, which has a high phenolic resin content to block UV. Lots of guys glass and epoxy the floors of their wood boats, and learn the hard way that even the "UV stable" epoxies break down after a some time under full sun, without a few coats of spar varnish to protect them.
The product group I usually use is West System epoxy, and the resin is UV stable, but most of their hardeners are not. They make a special hardener for this application (#207), but even then most find something like Epifanes spar varnish over the top gives better life.
And just so you know I'm coming from having been there, here's my own little epoxy on wood project, held together with plenty of that West System #207 and protected by 16 coats of Epifanes. It ain't perfect, but about as good as one can expect for something that gets dunked in a lake and raced hard every weekend for 70 years. Varnish is of those "ounce of prevention" scenarios...
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