Review on 3M Marine Sealant 5200 - Black, 3 Ounces - Permanent Bonding and Sealing for Boats and Marine Applications by Javarie Brumfield

I've used it for everything from boat repairs to roof repairs. This is by far the best product on the market. The UV resistance distinguishes this product from others. Have you ever seen it chased after years of sun exposure with a standard sealer? The seal comes off and no longer seals. This stuff is durable. If you're on the fence, give it a try. It is worth not repeating the work every few years. I've been using this stuff for years and will always buy it for my sealing needs (even if it's overkill, I just want to get it right the first time).