its a spraypaint that bonds with the plastic, not just sit on it therefore you have no damn flaking, it also works great on metal models, and sits in all the creses, i found it much better than the GamesWorkshop undercoat.
its called pactra racing finish, its supposed to be used for the covers of model cars but worls well on models, also gives them a somewhat glossy look. it comes in colors like outlaw black, butcomes in small cans. They cost like 3-5 bucks a can, i got it form a normal hobby store, not a GW.
Some primers bound to plastics and are nearly impossible to remove, however, not without damaging the miniature in the process. I ask this because I sometimes get bad priming effects and usually have to strip them.
For plastics BRAKE FLUID works the best for me. Just drop the model in question into a tub over night. Be warned brake fluid DOES evaporate, so be sure you seal it. Next day take toothbrush to model, for stubborn patches soak longer.
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