My first post, and unfortuantely, it's a dumb question that has doubtless been asked plenty of times before. I couldn't see any old threads on this so I guess I have to ask it again.
I need to prime a polystyrene kit. It's made in 2-colour styrene and I want to give it an all-over same-colour base coat. OK, I know I can buy enamel primer in a tinlet, but I'm going to need quite a bit and don't want to pay through the nose. So I googled it. There seems to be a body of opinion that says you can use cellulose primer from Halfrauds and spray enamel over that. But then some websites warn that cellulose won't key to polystyrene, and the resultant finish will be fragile.
Does anyone have any personal experience or reccomendations on this subject? What primer do you use?
It's more difficult the other way round - acrylic over enamel. Enamel is regarded as being"hotter" than acrylic. This I think (not being a qualified chemist) is down to the solvents in use. Enamel has a higher oil based content as opposed to acrylic which is either water or a "lighter" chemical solvent such as isopropyl alcohol. Cellulose is "hotter" still. You can probably get away with acrylic over "hotter" base coats if you leave a lot of time for the base coats to "gas out", or in other words give the carrying solvent time to totally evaporate from the application. Thus the vapour is not trapped under the acrylic layer and can not react with it.
Probably an over simplified and not 100% accurate rendition, but one I can understand at least. Rich
In the art world using acrylic paint over oils is a No! No! Enamel is Oil Based paint so same principal applies. Enamel is OK over Acrylic or Cellulose but not the other way around.
An IPMS member since 1974. Also branch secretary Berkshire branch in 1975. Edited IPMS magazine late 70's 2 years, serving the National Committee. Judged at SMW recently some car classes. Main interests are cars and and sailing ships. Still trying to convice people that IPMS is not just aircraft!
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