What glue/cement to use and do I need a primer?

Discussion in 'Anything DIY Related' started by 2balive, 2 Jul 2014.

  1. 2balive

    2balive

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    Hi, I am preparing for the big glue this weekend, and thought PVC is PVC and PVC cement is PVC cement, but reading on a few DIY sites, it does not appear as such?

    "Use the proper solvent for each type of plastic 1 of 1 Match the solvent to the pipe For a reliable seal, you have to use the solvent that's formulated for the pipe. All of them contain aggressive solvents and adhesives, so beware of drips and spills. There are three common types of plastic plumbing pipe: PVC, CPVC and ABS. Each requires a different kind of solvent cement. The white or beige pipes (PVC and CPVC) also require a primer. You don't need a primer with black ABS pipe. Read the label to match the solvent cement to the type of pipe you're using. Avoid universal solvent cements. Read more: http://www.familyhandyman.com/plumbing/how-to-glue-and-join-pvc-plastic-pipe/view-all#ixzz36KuiRUxC"

    I am using the normal grey fittings, black and blue pipe.

    1) do I need a primer?
    2) is the black and blue pipe both PVC, and what cement should I use?

    Thank

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  3. mariusmeyer

    mariusmeyer

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    Normal tangit pvc glue is fine or pvc weld. Never used any primer on my plumbing and never had any issues.
     
  4. RiaanP

    RiaanP Moderator

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    you going to be on a high all weekend.
    Open up those windows.

    On pipes under pressure I use PVC Weld. Works fine. Other pipes that runs under gravity (like in the downpipes) I use silicone. I tend to change things, so the silicone allows for removal and changes. Just ensure that the pipes do not move at the other end when you add the next fittings on the opposite end.

    As far as I know those fittings are PVC as well.

    Just not sure what black downpipes you used.
     
  5. leslie hempel

    leslie hempel Moderator MASA Contributor

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    for PVC tangit is the way to go, the biggest point i must stress is that you sand the inner of the fitting and the exterior of the pipe to be glued together, this will remove the shiny coat and allow proper longterm adhesion, i have already glued joints and restored water flow within 10 minutes of gluing with no ill effect to the inhabatants... im not a big fan of using silicone as the inner diameter sometimes becomes clogged with the excess glue, but with regular practice im sure you can find a system that works to iliminate this.
     
    Last edited: 3 Jul 2014
  6. RiaanP

    RiaanP Moderator

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    Yip, do not smear the inside of the fitting with silicone. Only the outside of the pipe going in. Nice smear around, and when pushed together, give it a slight twist.

    Else if you smear the inside of the fitting, the excess silicone will just be pushed out into the fitting as a ring. And that will limit flow. Same can happen with PVC glue if you smear too much of it on the inside as well. worst is you will only see this one day when you take the pipes apart.

    Best is to only smear glue or silicone on the outside of the pipe being pushed in. That way all excess glue or silicone will be pushed out and can be wiped away.
     
  7. 2balive

    2balive Thread Starter

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    Thanks for the info.

    I will definitely do the silicon on the downpipes, think that they are going to change again ;) Will follow the one side only advice.

    I got the black pipe from Sam's Irrigation.

    This is the stuff I got to clean and glue. No idea what the PVC-U means?

    Thanks, will remember the sanding bit.

    PVC stuff.jpg
     
  8. RiaanP

    RiaanP Moderator

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    that is the right glue.

    Enjoy the fume high... :tt2:
     
  9. NO3

    NO3

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    do yourself a favor and buy a pipe cutter too!! like scissors for pipe!
     
  10. 2balive

    2balive Thread Starter

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    How does it look and where do I get one in Cpt?

    Currently using a power Jigsaw.
     
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