Rubber membrane, tin or aluminum?
Then it don't really matter, I've not actually done the work, only witnessed it.
The Goodyear membrane was about the same as patching a bicycle tube when you was a kid but some people will place a patch beneath and over the tear. The membrane material is sometimes hard to find, usually from a commercial/industrial roofer.
I have seen aluminum holes and tears patched with pop rivets and sealed with 5200.
I know this is not much help.
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'75 Cuddy with '00 Johnson Ocean Pro 150 horse
Benny
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