Do I let primer dry before applying cement?

[Kinetic]

do I let primer dry before applying cement when doing plumbing? Should I apply primer to the pipe as well as the inside of the fitting?

thanks!

 

[dswong01]

When your priming you pvc you actually providing a good surface for to glue to bond to. the answer would be yes primer both . Let primer dry for about half hour before applying glue.

 

[Qwiv]

You don't have to let it dry!!! Just wipe it off with a rag. If I hired a plumber that said he needed to let it dry, that guy would be out of a job in 2 min flat.

 

[funman1]

umm yeah, I've done alot of pvc, I don't even wipe it off.

I just wait 10-20 seconds then apply glue, my glue wand always ends up purple or blue but I've never had a leak and it's always fine..

 

[Elite]

Why bother with primer?? I don't use it at all and never have any problems.

 

[Mr. Ugly]

Google is your friend. I don't have a url handy, but you can find manufacturers info regarding best practice for assembling pvc pipe joints.

If I remember correctly, they don't want you to let the primer dry because the primer softens the plastic and lets the cement soak in and bond better.

If you let the primer dry, the cement/solvent doen't penetrate as well. Also the pvc will have become swollen, and can be harder to fit together.

 

[UCanDoIt]

ABSOLUTELY CORRECT!!!

<a href=showthread.php?s=&postid=7249721#post7249721 target=_blank>Originally posted</a> by Mr. Ugly
Google is your friend. I don't have a url handy, but you can find manufacturers info regarding best practice for assembling pvc pipe joints.

If I remember correctly, they don't want you to let the primer dry because the primer softens the plastic and lets the cement soak in and bond better.

If you let the primer dry, the cement/solvent doen't penetrate as well. Also the pvc will have become swollen, and can be harder to fit together.

 

[Kinetic]

hi guys, shortly after posting I googled and figured it out. My primer is clear so I can't really see it. I let it sit for as long as it took to re-cap the primer can and uncap the cement can.

I'm just practicing on in tank spray bars for my prop tank, so far it worked out pretty good =) Don't have any sump returns etc. yet so no leak testing on my skills yet

thanks guys

 

[Reefugee]

From http://www.reefcentral.com/forums/showthread.php?s=&threadid=832204

<a href=showthread.php?s=&postid=7249945#post7249945 target=_blank>Originally posted</a> by mn95616
From http://www.oatey.com/faq.asp

Should primer or primer/cleaner be allowed to dry before applying solvent cement?

Because the primers will soften the pipe surface, it is important to apply cement to the pipe and fittings while the primer is still wet for maximum bond strength.



http://www.easy2diy.com/cm/easy/diy_ht_index.asp?page_id=35720503

Before the primer has had a chance to dry completely, work quickly and carefully to apply non-diluted solvent cement to the end of the pipe and the inside of the fitting socket using the dauber that is included in the can. If you are applying cement to pipe with a diameter greater than 3 inches, use a brush applicator that is one-half the pipe diameter.

 

[Vincerama2]

The primer is purple so that plumbing inspectors can confirm that primer was used.

I always use it because it makes the cement more effective and it's cheap. The downsides of it are that it makes things purple and if you don't have good ventilation or accidentally breathe some in, it makes your lungs burn is a very disturbing manner! So do yourself and your lungs a favour and open a window and use a fan!

V

 

[Kinetic]

i use Oakey's clear primer =) it's completely clear. I guess it's good when you're working pieces of plumbing that you don't want to be purple. plus I'm using black PVC so it'd look even cleaner w/o the purple.

 

[Qwiv]

I love the clear. It doesn't work very well on spaflex however.

 

[Kinetic]

it doesn't? i thought the purple was just a purple died version of the clear?

I'll go get some purple stuff instead for my spaflex.

 

[Qwiv]

oops, I meant the glue. Use the special spa-flex glue. It dries semi-flexible. the heavey duty gray stuff works OK.