Actually, I have a fiberglass trailer that has developed some hairline
cracks on the top. I had refinished it about three years ago with bondo and
Easypoxy. I guess the Easypoxy is not flexible enough to handle the demands
of a flexing fiberglass tube trailer.

Given your druthers, would you go with Senour's or Kool Seal, or is there a
better product for fiberglass shells? FWIW, I'm not obsessed with how shiny
the finish is; I'm more interested in weather proofing and longevity. TIA.