I've begun removing loose original rivets and replacement pop rivets in my 1960 Crestliner Flying Crest. I'm going to hand buck in new solid rivets in most spots and maybe use a few screws to pull things together in a couple of places. After doing extensive reading in this forum and elsewhere, I'm wondering about the pros and cons of using either 3M 5200 sealant or Gluvit epoxy to seal up seams when I'm done. The paint on the outside of the hull is in pretty decent shape, so I'd prefer to do most of the sealing on the inside if possible.
I've never used either product, but am hoping I won't need to buy both. They're expensive! Here's my evaluation of each, although I'd appreciate hearing from anyone who has done similar repairs with either one.
Pros - can be brushed on and might flow into seams; hard but flexible seal; may enhance structural strength(?)
Cons - has to be mixed; needs to be applied to bare metal; must be painted where exposed to sunlight; 2 coats recommended
3M 5200 Sealant
Pros - can apply as much as needed at a time; can (must?) be applied over paint; can be shaped with putty knife; single application required; could dab onto rivets or screws when installing; doesn't need to be painted
Cons - won't flow into seams; slower application; bare metal needs to be primed