POR-15 Super Starter Kit Gloss Black
Product Review (submitted on May 22, 2013):
I had no idea this was so solid! This is MUCH thicker than any spray on/paint coating! It is a little messy, so you need to keep brushing over the parts the POR15 might collect in (little pockets etc). Also tape up any holes that the solution may seep into. This stuff dries very hard, so it will be difficult to remove when it is dried. Otherwise, I think it will protect the metal for a long time.