Collinite 845. I have used this as a sealant for years for a few reasons - 1) marine grade so it resists almost everything and 2) it won't mar/color change plastic when you use it on the paint. Great stuff, long lasting, goes on thin, wipes off easy - lasts for months at a shot. Also used it on my boat for lake/ocean. Likewise, super durable and easy. BassPro/Cabelas usually stocks it.