This question ofen comes up and Eribafolk member Len Amey posted this on Facebook.
Zitat
"I posted this in reply to the same question a few days ago. I used it when I was a boatbuilder to repair new yacht superstructures if they came out of the mould with minor blemishes."
Gelcoat.jpg - Bild entfernt (keine Rechte) Sorry, these instructions have not come out too well but you get the gist.