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Dan Wrote
"The PVA works pretty well but what I don't like about it is the way it
beads up on a waxed surface so when it's a hot day, it's OK to mist coat the PVA
then apply more as it builds up thicker. But what I REALLY liked was a
product called PV6 from Finish Kare. It was like a solvent based PVA that
didn't bead up. It also gave a mirror shine so you didn't have to do
perfectly glossy parts to get a glossy mold. Unfortunately they went bust
so I don't know of a replacement. And PVA was NEVER used on the inside of
a "real" mold since it left a fairly crappy finish with orange peel. But
it certainly would keep the resin from sticking to Bondo so that is a viable
option."
<snip>
Ok, first things first.. [Disclaimer] I've never
done this.. but have talked to a local fellow who does it every day and
claims it works great. His claim is that he polish's PVA after putting it
on w/ some mold release wax. His molds are all a grade A finish inside, and he
was having the same 'Orange Peel' problem with his parts. His solution.. spray
on the PVA let it dry.. and then buff it back to a Grade A shine.. Claims if
your gentle and not to aggressive you can do it every time.. and have the
benefits of PVA w/ the finish of a wax/polished surface.. It's probably not
something you'd want to do continuously for a production process but... might
work great for a couple smaller parts. He builds Tub Surrounds and Truck
Toppers..
2 Cents
Jarrett Johnson
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