Reply To: What do you use to seal block halvles? permatex aviation sealant ok to use?

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December 19, 2018 at 10:15 am #160695
fisherman6
Participant

    US Member

    I second the Yamabond that Dale mentioned. Use the non-hardening formula. (#4 I believe) It is made for sealing crankcase halves on 2-stroke snowmobiles and motorcycles and there is no reason it won’t work just as well on outboards. As everyone says, a VERY thin coating is used.
    -Ben

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