Shawn wrote:
: From what I've been told, polyester doesn't stick very well to anything but
: more polyester. Epoxy has better adhesive qualities, so sticks to other
: things better. If the epoxy is cured, there won't be a lot of open
: molecules for the polyester to bond to.

Paul wrote:
: Well, epoxy over epoxy does not have a chemical bond either, it is all
: mechanical and in both cases (e over e or poly over e) you need to sand
: the epoxy before coating with just about anything. The only chemically
: bonded finshes that I am aware of are lacquer, shellac and waterbased
: varnishes. They will chemically bond to each other and form one continuous
: film regardless of how they are applied. Other finishes need mechanical
: means of adhering and require sanding in between coats.

Sorry, my last sentence was misleading. When epoxy is cured, there aren't many open molecules for anything--epoxy or polyester to bond to with a chemical bond. Still, epoxy is a much better adhesive than polyester, and will form a much stronger and more reliable mechanical bond with the same roughed-up substrate.

Sahwn