I have always used a light coating of spray gasket sealer on any head gasket I ever used. I figure a light coating cant never hurt any and could help it seal up. Never had a problem and did the same on my Comedic gaskets on my old 440 that I built in 2006 and is still running fine. I have the Felpro gaskets on my eng in my car now and they got a light coating. This eng has been in the car since 2011 and never any issue's and never been apart. Ron