If your talking about the short adaptor that goes between the turbo and the intake. It takes two rubber O rings. Sealant may cause a problem. I would use something to help lube the rings but, not make them hard. I used a little petrolem jelly on mine to help them slide in without twisting or spliting. Just my thoughts.
the first time I did the turbo i used anti seize and it worked OK i guess. but the second time i didnt use anything and it went together fine. The way I found to work easiest is to seperate the adapter from the turbo and smack the adapter in the intake by itself, then put line up the oil drain return and smack down the turbo....much easier said then done...prepare yourself for a huge headache