Neil, engine assembler at Gessfords, pointed out that coating the bore and pistons with engine
oil (upon assembly) means the
oil is simply wiped off with the first stroke of the piston. His opinion was that Marvel left behind a 'film coating' that wasn't easily wiped off. He also mentioned you could use several other products similiar to Marvel to achieve the same effect when engine building. A BIG plus for him was that it avoided the mess that comes with using engine
oil.