I only let the sealer "skim over" for about ten minutes or so when using it on the ends of the block for the intake manifold.
I also use it to "glue" the cork gaskets to the valve covers.I don't use any sealant on the cork valve cover gaskets to the heads.
When using on head bolts, I just apply it to the threads only and install with no "skim over" time. I put a few drops of oil under the heads of the bolts. Then torque from the center out in three step increments. This works for me.