I'm just finishing up redoing my entire fifth wheel… Graphics and roof recaulk and coating. I have several solvents in my garage and I ended up mixing mineral spirits and xylene about 50-50 and that worked the best of all the solvents I had around. It still won't completely dissolve any of the adhesive or caulks but at least it softens and makes it easier to scrape off. I scraped off all the black and cracked caulking on the roof and left the rest of the caulk that was still clean and stuck good. I replaced all of the round head screws with countersunk flat head screws and did a nice smooth re-caulking. After the caulk was set up I put eterna bond tape over it and then the roof coating over everything. I think the self-leveling dicor caulk is garbage because it shrinks so much so I used the non-self-leveling dicor on the roof. I removed all the trim pieces and fixtures on the sides and cleaned off the old Geocel and putty and reinstalled everything with a good grade of latex caulk and wiped off the excess caulk after everything was tighten down.
FWIW, i've been getting away from any petroleum based caulks, little by little. I replaced a skylight in 2016 after a hailstorm and I used Latex caulk and it was still white and in excellent shape. Craig
