"Jarrett Johnson" <jjjohnson@accesscomm.ca> wrote:


""
His
molds are all a grade A finish inside, and he was having the same 'Orange
Peel' problem with his parts.
""

When I first started using PVA I fought the same orange peel problem.  The trick to getting a glassy finish on the PVA is to fog on the first few coats. I tried using those Preval sprayers (the ones that use a disposable cannister of compressed gas) and found their dispensed particulate size from the spray-can-type nozzle to range from mist to droplets.  The PVA wouldn't flow out so it layed on a bumpy surface.  Additional coats wouldn't remove the initial bumpiness.  I switched to a standard touch-up gun ran at high pressure (70-80 psi) and limited the material delivery to the "just barely flowing" condition creating a fog rather than a mist for the first few coats and solved the problem.  Works every time.

   <Marv>