Hi, I plan on replacing the 2 back to back propeller shaft seals and the big O-ring seal in my lower leg,reading the manual it calls for gasket sealing compound around the 2 seals and triple gaurd grease for the O-ring,my ? is can I use anything else for the steps as I am not near any marine shops,I imagine ordinary grease will be fine for the o-ring but gasket sealing compound? Does it have to be marine grade? Anything else I could use? TIA