Silicone has a reputation for coming loose over time, leaving a residue that is very difficult to remove, and generally does not allow use of another kind of sealant without removing that residue. Silicone has it's uses, but not with our RV's. Dicor lap sealant, both non-sag and self-leveling are the best sealants for our RV's in my opinion. I have discovered another sealant brand(can't remember name now) that has the same qualities as Dicor, plus has a stretch factor of 300% before losing its sealing qualities.
2000 Winnebago Ultimate Freedom USQ40JD
, ISC 8.3 Cummins 350, Spartan MM Chassis. USA 1SG, retired;PPA,Good Sam Life member."We the people are the rightful masters of both the Congress and the Courts - not to overthrow the Constitution but to overthrow men who pervert theConstitution. "Abraham Lincoln"