I have to replace a skylight. I just received the replacement from the manufacturer. When I go to install the new one, what is the sealant? When I was on the roof, I saw the same white sealant used...
I checked out the NuFlex 311 white sealant as suggested by member ronbiel as I had not heard of that brand before. https://www.amazon.com/Hengs-95502-White-NuFlex-Sealant/dp/B003YJNO98
Seems like a respectable product, albeit quite a bit more costly! It is self-leveling which is what is good for a roof application. Do not use self-leveling on the sides of the RV... it might end up looking like it is owned by Salvador Dali (LOL.)
Also- whatever you do...DO NOT USE SILICON SEALER!