Spray varous engine bits like cam cover, manifold (when i get rolla one) etc as far as this goes bud all you want to get hammerite its the SIZZZZ cums in all coolers and gives good finish, add a bit of laker ind its evan beta thats what i use for all then bits you sad and don't worry bout the heat proof its cool with the hammerite it don't need to be heat proof bud