I would use Goop... The same as Shoe Goop,Shoe Goo,Auto Goop ect.
It holds up to acid,oil and holds better than RTV
I find the Goop sticks to anything tenaciously and remains flexabile. I fix a lot of plastic with it and zip ties. Can’t use zip ties on this repair.The same company that developed Shoe Goo also developed Seal-All that is gas and oil resistant .
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