Kevin Kossi <kevin@airforcemechanical.com> wrote:

 I followed Don Barns advice and sprayed the PPG epoxy white mixed  with the
clear Jeffco Resin. 50% Resin was a bit too thick, 40% was  perfect. It took
three days to fully harden but it came out perfect.  It's really white and
really strong.

Kevin,et al,

I've seen this mentioned a couple of times here and I'm wondering whether it's a good idea to mix dissimilar epoxy systems together.  The reason we mix epoxies according to a specified resin/hardener ratio is to insure that the matrix achieves a complete crosslinking of its molecules.  It seems to me that mixing two different systems together could possibly change the chemical characteristics of both systems, resulting in a mixture that may or may not meet the intended cured spcifications of either product.  Are there any chemists out there who would care to comment?

   <Marv>