I ONLY thing I use on gaskets for the past 20 years http://www.permatex.com/products/Aut...ve_Sealant.htm
If that dont seal it, there is something else wrong. The gasket is the sealer, the Hi-tack is just to hold it in place

The ONLY place RTV belongs on an engine is where the pan gasket meets the front/rear main and where the intake sits in the front and rear of the block. It belongs NO WHERE ELSE on an engine