Not too hot with the anitifreeze, though. I learned that the hard way. The ethylene glycol with evaporate very quickly as it heats up, and you'll be left with a black sludge residue that you'll have to clean out of your engine. Lucky for me it was just a muffler. I couldn't imagine trying to clean all of that stuff out of the intake ports!

Sounds like you might have hydrolocked the motor. Too much fuel in the cylinder, and it won't turn over. Forcing it is NEVER the answer--no matter what. If it won't turn over, DO NOT FORCE IT. There is something wrong. Unless you enjoy buying engines, you need to heed this advice!

BTW,
Piston heads are going to have a funky color to them--imagine all the abuse they take. Brown varnish is normal, and indicates burned castor. Black stuff, however, usually indicates aluminum shavings.