I’ll say yes. My trailer is outside 24/7/365 and has been since being purchased in 2017. I have washed/waxed it at least twice a year over the years and gradually the shine had disappeared. When I’d do a thorough job, it would take me four days. No telling how many times I’d move the ladder or how many times I would climb up and down it. One of the last times I washed/waxed it I fell off of the ladder, hit the rear bumper and ladder on the way down to my asphalt driveway. I was lucky enough not to break anything. Since having the trailer coated it is much easier to wash and a quick spritz of the CGI magic elixir and it shines better than new. More important than the shine is the long term protection of the gelcoat. Additionally, as everyone else has said, is the fact that the CGI guys are the finest group of guys that you’ll ever meet.