Sealing 1988 Skamper roof top edges and seams

[LivPurple]

What product is best for sealing 1988 Skamper roof top edges and seams?
I washed the top of our pop up this morning, and the growing moss all along the edges revealed openings that should be sealed. I know there are lots of sealing products on the market, but I also know some are better and more appropriate for certain materials. IDK what a 1988 Skamper top is made of, so that's a problem as well.

 

[Sjm9911]

Dicore sealant is what most recommend, self leveling for the top no sag for the sides. Any polly baised caulk will do. But its hard to say not knowing what exactly your sealing or what it was sealed with previously. A picture would help.