I think the previous owner used regular tub and shower caulking to seal the nooks and crannies (and the roof rails) - will this be a problem in the long run? Should I use a caulk remover to remove it and use something different? What product do ya'll recommend to seal? Also, can I paint over caulking (existing or new)? I'd like for my roof to be all one color, and it's faded in some spots and the caulking is this off-white/yellowed color - yuck. What kind of paint can I use for the roof? Flex seal paint?