I have used PlastiDip https://www.plastidip.net.au in white. Not specifically for weather proofing, more for diffusion. But it works both ways if you spray enough of it.You need to lay on about 10 coats with a 10 min interval. Make sure the spray can is about body temperature as well, warm it up with warm water
Wow. Yeah i think I try some of that. I have some strips in glass bottles and pretty much looks like led strips in glass bottles. I think I try some combination of this stuff. Thanks.