Hi Edd.
Acrylic is a big no. For body shells you only should use polycarbonate paints in nice thin layers. Acrylic will just flake off almost instantly with body flex.
See-through/transparent parts will be fine and should not induce any other paint cracks.
Tamiya do a "Smoke", which is (off the top of my head) I think paint number PS-31. This gives you a nice tinted style effect on the windows. All your paints should be PS- codes, PS meaning polycarbonate spray.
Tamiya do make the best spray by miles, if you paint it well (a few very thin coats, rather than one thick one) it will stick to the shell and last a long, long time. However the Acrylic sprays are for hard plastic, and not shells. If a model shop sold these to you knowing it was for a bodyshell....... that's very bad.
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Jason Moller
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