Just placed order with SPI for flat black and activator to spray dash. SPI only sells flat black in gallons, so going to have a ton of leftover paint. Wife wants me to paint some metal lawn furniture, so may use the leftover paint there. Any tips on how to spray inside cowl cavity? Should I brush paint that area? I don think I can get a gun to spray well in there. My first thought was to hand sand all the nooks , then scuff, then wipe down with wax and grease remover, hand paint epoxy, then hand paint flat black?