BoatBanter.com - View Single Post - polyester

On Wed, 16 Jul 2003 22:53:28 -0400 (EDT), (Ron
Thornton) wrote:

I believe epoxy bonds to cured poly better than poly to cured poly, but
it's been so long I'm not sure. Any chemists out there?

Ron

Once its cured its all the same - its just another surface.
But epoxy would have the better flow, as a wetting agent, ionic.

So better able to get into all the scratches etc -so its about its
mechanical ability to flood the surface area completely.
While poly is a bit lumpy as in viscosity

But you can test it by sticking a piece of paper in both see how they
climb. Or a measured drop on paper and see which makes the biggest
circle, for spread, That kind of testing will give comparisons. plus
others.
I have stuck stuff with poly, its okay - but its not considered an
adhesive as epoxy.