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I dont know about the paints durability. But you might be able to get more out of it by getting a good auto primer. Primer is very reasonable even on a very tight budget and redused a gal might make 2 gal. depending on type and manu. Also a couple of cans of plastic adhesion promotors for the front and rear bumpers will help with the paint stay. Cant gaurantee how well the dupli and car primer will adhere to each other but with the primer you prob will get the best bond for what you want to do. Napa paint is also prob preetty cheap. As long as you put the effort in with the prep work it prob turn out ok if not decent. On a side note I had spraypainted my 81 camaro with john deer spraypaint. The yellow and black both held up well for over a yr. than I wanted different colors so used silver and blue. The john deer blue faded in a couple of months. Its gonna be hit or miss. I wish you luck and let us know if it works out.