To: KCDT and the world:
You wrote:"I've been using DVA Acrylic and Plaster Separator. Some kind of formula involving PVS solids. " Thanks for the suggestion and I ordered it on your recco. I think one of the other posters may be confusing your suggestion with DVA's Very Special Seperator" - I looked it up your suggestion in Pearson's dental cat. and it definitely lists the prodict as a "plaster AND acrylic seperator" - 16 oz.
What is your application procedure on the model?Applied hot,cold, multiple layers,blown off, etc.
Also related to another comment:
I have been using .001 tinfoil for doing acrylic repairs for 35 years and although it takes a moment to burnish-about 10 seconds ( and attach the edges beyond the repair with setup wax) , the repair comes out absolutely shiny, nothing to clean off and sooo much nicer than a chemical release film. If you puncture the foil applying just put a little setup wax on the offending area. Also if you are up against a denture tooth and don't want to survey out the u-cut apply a little melted red boxing wax in the undercut over the foil and it will release as you pry it off. Complicated multi-step constructions such as swing-locks can be made with no danger of acrylic bonding and come out already polished. If you are doing a denture palate repair no need to tack with wax.
Wow! welcome. Do you have any pictures of these tin foil techniques? I'm fascinated. I would love to learn a new trick! So are you burnishing your model during a repair, or are you burnishing it to the assembled pieces and then pouring against that? Inquiring minds want to know. Can you burnish against lab putty?
As for the DVA Plaster / Acrylic Separator. I let the molds cool some ( I microwave, so the flasks don't retain heat as long as bronze. Usually I'm grinding the basel of the teeth ( I often diatoric too) to prepare for bonding, then I apply the DVA with a brush, no pour in.Not too thick (don't let it pool, thin even coats work best),but cover all stone, let dry And paint another layer. The instructions call for two, but I do three. Depending on conditions its dry in 10 minutes or less.
The mold will look shiney, but there is no film or film thickness, The detail reproduction is really good.
Coupled with the shelf life this has become my favorite, hands down. Works with cold or heat cure.