To quote the MaxProp Installation Manual, "NOTE: DO NOT USE TEFLON GREASE it will wash out very quickly.". But I tried it anyway, since a head is not nearly as harsh. It dissolved the new rubber piston rings on my Groco HF heads and I had to clean the cylinders, replace the piston rings with the hard plastic (old) version. It also says it is safe for rubber and plastics, but it failed on two separate heads. So no SuperLube Teflon grease for my application. I never got to find out whether the application was severe enough to wash it out.