:agree2: maybe a dab just to hold it in place for instalation, but grease works better. Its easier to clean off if you screw up have to do it again.:doh:You don't even want to know how many times I have screwed that o ring up installing a water pump... they are a pain. I use a little grease to hold it in place.. Glad you got it going.. I'm not a big fan of rtv sealant. That is my own choice not to use it unless I feel its required. most cases I won't use anything other then the o ring.