There are some RV products that you can’t live without and at the top of the list would be a good sealant. The damage created by moisture leaking into a RV can cost an arm and a leg…or any other body parts you care to surrender. Sealants on the roof systems are crucial and they need to do their job with a vengeance. There are too many folks who’ve suffered the cost or repairs because of sealant failures. It takes vigilance on the owner’s part of inspecting and refreshing the sealants yearly if needed… and is an important part of RV ownership and maintenance. Dried out or cracked sealants can be the culprit and need attention. Make sure someone attends to that task. It’s a low cost maintainance product with big dividends. I’ve found Dicor sealants to really do the job for sealing out water. I’m a big fan of self-leveling Dicor sealant for sealing roof penetrations. They make a number of products for the roofs of RV that you can explore at their website, but in the roof maintenance world their sealants are king. But that’s just according to me…and a few others. I’ve used their self-leveling sealants to refresh cracked roof sealants and the new installation of solar panels on my trailer roof. I sealed the solar panel brackets and screws I used to secure the panels to the roof. None of us like to create new roof penetrations but using the proper sealant reduces or removes the possibility of problems. Enough said.