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Originally Posted by jasolbes
My personal choice has been (for more than 20 years now) DuPont's Universal Primer (Value Shade) #'s 41SM (white), 44SM (light gray), 47SM (dark gray). This primer is intended to be used for acrylic lacquers, I apply it with an airbrush (30/35 psi), it's harmless on Tamiya and Fujimi plastics and protects it from acrylic lacquers. Hope this is of any help.
José Antonio (México)
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Back in ancient times, I was happily using SEM high-build automotive primer on resin models. Expecting no problems, I sprayed a Gunze Sangyo body with the stuff, and it etched the heck out of the surface, destroying the model. (I've heard since then that Gunze plastics are - or were - more easily damaged by some chemicals.)
So I've stuck with Tamiya primers ever since, despite the higher cost.
Information like Jose's is very useful, but if you're using unknown products on models, test, test, test! And that applies especially to automotive products, which have gotten more and more exotic because of environmental regulations.
Ddms