Join Date: Sep 2005
Location: New Westminster, BC
Thanked 587 Times in 558 Posts
Rep Power: 16
Re: Epoxy vs Polyester Resin for Repairs
When resins are laid up originally they form a 'chemical' bond. When things are 'fibreglassed in' after the fact you're dealing with what is called a secondary bond, which is really the ability to 'stick' to the substrate. Epoxy has a much stronger secondary bond over polyester as celenoglu indicated, and is therefore much preferred for after-the-fact repairs, esp when the original polyester is no longer 'green' or fresh.
1984 Fast/Nicholson 345 "FastForward"
".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)