The cap bolts are well away from that area and there is no place for any RTV to get trapped causing clearance problems, and I have never had a problem doing it.
(never had a rear main area leak after doing them that way either)
Just a light smear that you can almost see through does it, and the reason I do that is because of the oil pressure right there and that it can easily go around the seal and between those mating surfaces. (seen it happen more than a couple of times)
