Need help pipe glue...........


Old 12-31-13, 07:00 AM
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Need help pipe glue...........


Sorry it wouldn't let me post a new thread so I found one as similar as I could:

I have a pvc pipe (water line) I had to cut because of a leaking problem but the cap I put on it keeps shooting off. How do I get this thing to stay on the pipe?

I used purple primer (Oatey) and MP-6 medium bodied multi-purpose cement glue for the cap. Had to cap another line as well but it is holding just fine. This will be the 4th attempt to cap this thing and it is about to get very cold here so I don't have much time.

What can I do to keep this thing on? Also, what could be the reason it keeps coming off? Wrong glue? Please please help.
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Old 12-31-13, 08:13 AM
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Moved to own thread......


That PVC cement should work fine. Possibly you have the pvc too soft now from trying to glue it so manyy times... Get new cap and cut pipe to have a clean section...

Try again and let it dry an hour....
Old 12-31-13, 08:54 AM
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Thanks for making me a thread. And for the suggestion. Will cut and reglue again, hopefully it will work this time, going to get very cold soon.
Old 12-31-13, 11:26 PM
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You DO need to use the proper materials. You cannot mix different types of plastic and expect proper results and you need to use the cement for the type plastic. In other words, you cannot use a CPVC cap on an ABS pipe with PVC cement. You also need to allow a proper amount of time to elapse before re-pressurizing the system, this time IS dependent upon ambient temperatures and could be several hours.
Old 01-01-14, 04:02 AM
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People I have helpd with a similar problem have gotten confused about what type of pipe they have.
Here pipe colors are generally; pvc for water - white, pvc for electrical-grey, cpvc-light beige and abs-black.

There is a somewhat confusing array of adhesives for these types because of added transition chemicals for joining dis-similar types of plastic.

Also, I can't quote specific temps but cold temperatures don't produce a very good joint.
I would say you need normal room temperature for the bonding to take place.
Old 01-01-14, 01:00 PM
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Hi, You stated you glued one pipe and it worked fine and the other pipe didn't, That makes me think that one pipe was cold water (pvc) and the other was hot water (CPVC). pvc is a little bigger than cpvc. You bought 2 pipe caps (pvc). One worked great the other is giving you the problem you have. I think you need a cpvc pipe cap.
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