I guess a guy can use whatever trick he desires but typically in a production Facility the mold is waxed multiple times as a safety barrier first, then PVA is sprayed over the top of the wax every time you prepare the mold for making a new part in the same mold. If you are just going to make a very few parts then just use whatever technique you desire as long as the epoxy doesn't stick to your mold. I have used many gallons of PVA over the years mostly many years ago. Water will wash or melt it off of any parts you may get it on. Easy to use. It is almost clear in color and almost seems like water. Use a small cheap paint spray gun that can be purchased at harbor freight, lowes lumber, Home Depot etc. spray a wet coat on your waxed mold, let it dry for a few minutes and spray another or several coats for mental insurance. Once it is dry, get after making your parts. If you were using polyester resin and going to make a boat for example, the next step after PVA would be to spray on a thick coat of gel coat which basically is polyester resin that is colored white or whatever color the outside color of your boat hull will be, next would be wetted out cloth to form the hull structure. Then cross bracing bulkheads etc. Screw down a floor, upholster side walls, bolt down your lawn chair, add your old riding mower steering wheel, steal your neighbors boat motor? Mount it go pull your wife on water skies! Hey easy wasn't it?? Just hurry summer will be over before you know it.
Larry H Jeff Lange wrote: > Brian, > > I supposed you could do it that way but the PVA would come off with the > finished part. I waxed on top of it and the final part was easily removed > with the PVA remaining attached to the plug. > > Jeff Lange > Race 64 - Skye Racer > Blog: http://schmleff.blogspot.com > Youtube Channel: https://www.youtube.com/schmleff > > brian wrote: > >> You are supposed to wax and then PVA. >> >> -------- Original Message -------- >> Subject: Re: KR> release agent >> >> >> Mike, >> >> Having used all sorts of things as mold release (and having just made >> a new nose bowl for my cowl), I have found polyvinyl alcohol (PVA) to >> be very easy. Its basically a sprayable rubber. Spray on a few coats >> as you would paint, wax it three times and nothing will stick to
