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Old 06-04-2015, 21:40   #16
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crazyoldboatguy's Avatar

Join Date: Apr 2014
Location: Chicago
Boat: Alden auxiliary ketch 48'
Posts: 814
Re: Which sealant for polyethylene holding tank

I'll never use silicon sealer on a boat again. You can't get all the stuff off if you have to. It leaves a residue that is a royal pain in the ass to deal with.

It will probably be fine in your application.

As for myself - I used 5200 when I bedded a thru hull into a polyethylene tank I installed as my holding tank. I did that 10 years ago. Not a single leak. Since it isn't likely to bond to the tank - if I have to remove the fitting it isn't likely to be a problem.

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holding tank, sealant

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