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Thread: Adhesive advice

  1. #1 Adhesive advice 
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    May 2013
    I am trying to waterproof a threaded pvc pipe through a 3/4" hole submerged 3 below the waterline. Between my 2 pvc nuts on either side I have a 1/2 inch plywood, and on the water side I have a poly sheet. On the water side it goes, threaded pvc nut, large pvc fender washer, 10 mil poly sheet, ply, then on the other side I have a pvc nut threaded onto the threaded pvc pipe. The seal needs to be between the pvc nut and pvc washer, and also between the pvc washer and the poly sheeting (both on the water side). The question is, what adhesive/sealant should I use? The other requirement is this project is a portable water cache and the adhesive should not affect the potability. If that is not quite clear, please ask.
    Thank you very much.

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  3. #2  
    Forum Radioactive Isotope cosmictraveler's Avatar
    Join Date
    May 2005
    Key West, Florida, Earth
    You could use PVC glue. It's intended for use on potable (drinking water) pipes and safe.

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  4. #3  
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    Apr 2007
    I'd probably use silicone sealant. With the plywood, there will be some movement due to shrinking and expansion, so you'd want something flexible.
    Sil-Bond RTV 4500 Food Grade Silicone Sealant Adhesive White 2.8oz
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