Steven, my experience with this has been positive. I don't remember having to put more than one or two coats down. I usually lay one coat down and use it to check my body work. I almost always find something that will need to be fixed, whether it be more filler and/or sanding or fuzz balls in the primer. I'll shoot another coat if needed. I do not recall it crazing plastic. I suppose it depends on the plastic in the kit, Revell, AMT, Tamiya, etc. I build all of them and do not remember having problems with any of them.