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please DON'T rattle can the car.. primer or otherwise. it will definitely make more work for someone who has to paint the car down the road.
rattle can paint is not catalyzed, so there will be no lasting durability whatsoever. even though you don't want that specific paint to last for looks, if you expect to paint over it later, it absolutely has to be durable enough to grip onto the paint underneath. basically, if you spray your car with primer or paint, it will have to be stripped before real paint goes on.
think of it this way... spray paint dries, but real paint hardens.
that's why it's no good to have underneath a good paint job. there's no durability. especially when you think about the fact that when most people psray their cars with rattle cans, they don't give the paint any kind of mechanical adhesion (i.e. sanding, scuffing, etc). they just spray away. add in a full winter, and like i said, that spray paint will probably need to be chemically strip;ped before your real paint job.
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