Stlhdh20,

Sorry I didn't respond to your question regarding the amount of coat-it some time ago, missed the question. I used two cans, they were like the pint size. It covered it well enough and after a winter of beating the bottom to death all still looks well. I am much happier with this product than the gluvit, no comparison. Use a large weed torch to remove it, comes off like butter. I would contact a automotive painter and ask them how best to deal with the paint on the exterior. Good luck to you.

RM