Been working for Gm for 40 years,Dielectric grease,gm part dept,west marine, your local pool warehouse, small tube about $5.00. Wipe off gasket, rub it on gaskets leave open for appox 5-10 min. Thats it. Gm use it for recondition of all there weather strips.Will soak into weather strip . Redid all my ports orginal gaskets no leaks.Use it on all the zippers. Put it in all your electrical connectors helps lower resistance in connectors.All most as many uses as wd-40.