Chainsaw Repair

I've only lost 1 piston do to a gasketless build using sealer.   Wasnt a saw I did and took on trade.
 Kept noticing  running odd at times and seemed to have carb adjustment issues. Tried a known good carb swap and samething. Dug deeper and it was a sealer giving out at base gasket area.

I have never had any problems using sealer for crankcase gasket, base gasket, or sealing tank halves that I have applied myself.  But I still prefer a gasket for base, but use sealer when needed.

The crankcase holds what, maybe 10 to 12psi.   I think myself that a good sealer should be able to handle that easy.    Also by using a copper gasket you now have 3 metals with different rates of temperature expansion.