How much does 500ml cover,can you store it for a while if you buy a large tin and use a bit at a time. I've read a bit about it a few on here use it , is that what is used on your whole chassis and bolt ons if so how much have you used SANM4N I've 2pac painted my tonna chassis but reassembly has given me a few scratches so might use por15 on my ute when I do it