RE: RC Surfer
Karl......I wise man once told me " if a tree falls in a forest and I don't happen to hear it fall - it does not mean that it did not make a noise"
Polyester resin is hydroscopic (it attracts moisture) - if the filler/sanding coat is left unsealed overnight - or - for some time in a certain environment - there is a good chance that moisture can contaminate the surface and cause the 'fish eye' effect to spoil the gloss coat when applied.
Bro'