"Gary Evans" wrote in message ...
I there a way to thicken gel coat other than letting
some of the solvent evaporate? Even the thinnest commerical
gel coat is made for spraying which makes it too runny
for filling small cometic chips. The only gel coat
paste fillers I have found are an off white in color.

Plastics shops sell colloidal silica filler, which you can mix in
the gel coat before adding the catalyst. It's white, and a whole
lot safer than microballoons, which can waft into your lungs
and do real nasty things.