yeah well you can drive it round but you gotta remember that the idea of primer is that it sucks up the first coat of paint and helps it stick. when you drive it you are basically sucking up all the tar/bugs/water etc off the road. then you block it back and paint it with the water sealed under the paint. the metal rusts, the paint lifts and then you have to do it all over again, but next time you gotta fix rust too.