I just replaced right side casing,but re-used the outer cover/gasket. Cleaned it with brake cleaner(gasket) &used alil' felpro hi-tack sealant. It was fine for a couple rides,now it's leaking;just ordered&recieved new gasket....long story short-my question is should I use silicone when I install new gasket??or just clean it good&put the new gasket on??