that thread sealent stuff you are talking about. is that just like locktite? like where i screw the fitting onto the oil pan put some of that on the thread before i screw it down? I got the fittings and line tested today, they said that its still good. Seems that when i tighten the fitting down. the next day it losened a little bit. im not really sure why.. but some people told me to use some locktite on it.