I recall using a product from Floquil called “Barrier” that was intended to protect styrene from crazing.
I’ve used Scalecoat I and II interchangably on styrene with no ill effects but on brass I stick with I. There was a time when I put a base coat of I on a brass model and shot II over it, also with no problems.
Good Luck, Ed
Yeah, I kind of remember Barrier. But this stuff was Glaze. My recollection is that Floquil recommended its use as a primer (though perhaps I misunderstood). Anyway, I used Glaze as a primer on metal, and plastic and Delrin sideframes. It seemed to “stick” real well. And once it was on, the following coats couldn’t attack the plastic unless you went nuts with your spraying (I try to avoid that).
Floquil also said to put some Glaze in your airbrush mix, maybe 5%?
But ya can’t spray what ya can’t buy, so here comes Scalecoat I.
Ed
There are a number of things that can be applied to various plastics to preclude crazing or swelling when solvents are subsequently applied. I seem to recall Vallejo primer contains one that works even in thinned coats. Perhaps Tamiya’s does too.
Does someone know the ‘active ingredient(s)’ in Floquil Barrier?