Spray paint has zip for durability compared to a 2-part paint. If you're painting something that doesn't matter, fine. If it's something that will see wear or chemicals, it will be a problem.
yet many praise stuff available in rattle cans from many restoration supply companies for many high "abuse" areas such as under hood and suspension items. are these sold only for "trailer queens" ? the adds for such products suggest not. and this does not include etching primer or two part paints available in rattle cans. so how can someone come to a correct conclusion for their needs ?
