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pvc primer help

Post about things you have launched or thought about launching. Also post about various materials used for building cannons. No posts about explosive projectiles!
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Unread postAuthor: theBOOM » Mon Aug 17, 2009 3:02 pm

Guys I know this is a little off topic but I have 2 questiones about primers and such...

Ok so I've heard that acetone can be used to CLEAN the pvc pipe and all the dirt that they have in them....since acetone works mostly the same as primer would using acetone on the pipe and not glueing it weaken it after? I've read that if you wait the pipe will re-harden and nothing would have happened but is it 100% to do this just for cleaning purposes or would it decrease the pressure rating of the pipe/fitting being used?

Second is, what is better acetone or primer, Since I can't find any clear primer in my hardware stores I use acetone when I'm working with pvc... is this ok or should I just be more careful and use the purple stuff?
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Unread postAuthor: MrCrowley » Mon Aug 17, 2009 3:31 pm

FORE!!!! wrote:can i ask why u would recomend using epoxy over cement??

dwv fittings tend to be very shiny and smooth in the fitting with not much for the epoxy to grab on to,wouldnt a solvent cement make a better bond considering it basically melts the 2 surfaces together???

Why would you use DWV fittings with pressure?

FORE!!!! wrote:sorry about the missleadiing advice, i dont use primer at all i just use green pressure rated glue and havent had a failure yet with my cannon building and i use the crap everyday at work without a failure

Just because you haven't had a failure doesn't mean others wont. Also, I wouldn't know a plumbing company that'd be safe with you not using primer and letting the joints to dry for only half an hour before usiing pressure. Unless it's your own business, i'd check with your boss to make sure you are following regulations. There are standards that plumbers have to follow. If you're not a plumber, i'm not so sure if you have the same standards but I can't imagine them recommending no primer and half an hour to dry.
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Unread postAuthor: FORE!!!! » Mon Aug 17, 2009 8:51 pm

@JIMMY101
Thats the whole purpose of testing the installation before u leave ,not once the job is complete

a periodic test higher than the normal running pressure for a given amout of time,and u should be sweet,...
and if it dosnt blow out ,how is the inspector going to know if it was or wasnt done right??

6 years later and iv never had to rip anything out because of failure,i like thoses odds

@MR CROWLEY
why would u use dwv fittings for pressure=short answer i dont,i use pressure fittings pn18 unless it for a spray and pray,we were only presuming what rough boy wanted to use it on.
and u are right that there are standars to comply with,especially in n.s.w australia being the highest in the world,meaning if u get ur trade ticket here u can just about work all over the world without furthur training .anyways im simply stating that this is what i do and havent had a failure.

can someone explane why u dont have to use primer on stormwater istallations,but u do have to on house stack systems??,

@the boom ,what is this so called purple stuff? isnt primer red/clear,and the only reason it turns purple is cause u keep dipping the brush with glue on it in there..aussie primer is red/clear, altho it may be purple in america
i dont know. can someone explane?
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Purple Primer

Unread postAuthor: Technician1002 » Mon Aug 17, 2009 9:31 pm

Purple primer is used in the industry in most places as it makes a purple stain and makes a visual inspection of full proper coverage easy.

http://www.oatey.com/Channel/Shared/ProductGroupDetail/172/Purple_Primer___NSF_Listed.html
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Purple Primer on pipe.
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Unread postAuthor: jimmy101 » Tue Aug 18, 2009 2:04 pm

FORE!!!! wrote:and if it dosnt blow out ,how is the inspector going to know if it was or wasnt done right??

Like tech said, that is the whole reason for the primer/cleaner being purple. And, why it is extremely difficult to remove the stain. You basically have to remove the surface layer of the pipe to get rid of the color. The purple color is added specifically to mark that cleaner/primer was used.

Around here, no purple stain visible (or is visible around only part of the fitting's circumferance) means the building inspector will require the fitting to be replaced. Since replacing a fitting tends to be a PITA (you generally need to replace one fitting with at least two) the local plumbers are quite generous with the purple stuff.
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Unread postAuthor: FORE!!!! » Tue Aug 18, 2009 6:16 pm

so where does that leave clear primer?
i await for ur answer in anticipation :wink:
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I've used various things like cutting oil, silicone lubricant, even butter

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This collection of containers on your bedside table must look very intimidating to any visiting young ladies

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Unread postAuthor: Technician1002 » Tue Aug 18, 2009 6:51 pm

FORE!!!! wrote:so where does that leave clear primer?
i await for ur answer in anticipation :wink:


Clear primer is left to rain gutters, downspouts, dryer vents, PVC fencing and other non pressure PVC applications that are exposed to view.
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Unread postAuthor: FORE!!!! » Tue Aug 18, 2009 7:11 pm

so ur saying that u cant use clear primer on pressure pipe installation ,that are in full view of the public??

@roughboy
In the early days of PVC plumbing they didn't have the primer but instead used fine sandpaper to clean through the dirt and extremely hard outer surface of the pipe and fittings. It was only because some people didn't do this mechanical cleaning step that primer was developed.
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Last edited by FORE!!!! on Tue Aug 18, 2009 7:30 pm, edited 1 time in total.
al-xg wrote:
I've used various things like cutting oil, silicone lubricant, even butter

jsr wrote:
This collection of containers on your bedside table must look very intimidating to any visiting young ladies

...but hey, lube shows you care;)
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Unread postAuthor: Technician1002 » Tue Aug 18, 2009 7:30 pm

FORE!!!! wrote:so ur saying that u cant use clear primer on pressure pipe installation ,that are in full view of the public??


The inspector will fail it. Neatness counts. In public view, I have been known to mask off the pipe with a wipe of grease to keep runs and dribbles from messing up the look. After assembly the grease is removed and the primer just comes out to the edge of the connection when done properly.

Later I need to grab some pictures of other views of this joint. A very clean job can be done with Purple Primer if measures are taken to prevent runs.

EDIT; Photos of the joint were taken and are posted later in this thread.
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Damage1.jpg
This joint is assembled with Purple Primer. The primer ends just inside the edge of the joint so it does not show from the outside. It can be seen on the inside.
Last edited by Technician1002 on Wed Aug 19, 2009 1:43 pm, edited 1 time in total.
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Unread postAuthor: theBOOM » Tue Aug 18, 2009 7:57 pm

Any tips would be nice tech.. i usually am very cautious but ugh I hate when I just turn the pipe around and see a drop of primer going through the pipe .... :x :x
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Unread postAuthor: jimmy101 » Tue Aug 18, 2009 8:23 pm

Technician1002 wrote:The inspector will fail it. Neatness counts. In public view, I have been known to mask off the pipe with a wipe of grease to keep runs and dribbles from messing up the look. After assembly the grease is removed and the primer just comes out to the edge of the connection when done properly.

You can also use (blue) painters tape to mask with. It comes off clean without leaving any residue and gives a nice clean edge.
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Unread postAuthor: theBOOM » Tue Aug 18, 2009 8:34 pm

Thanks for the tim jimmy I'll def. try that next time I'm solvent welding something
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Unread postAuthor: FORE!!!! » Tue Aug 18, 2009 8:41 pm

or u could try using a pre soaked rag,and make sure the primer ends just before the end of the fitting,thats the easiest way
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al-xg wrote:
I've used various things like cutting oil, silicone lubricant, even butter

jsr wrote:
This collection of containers on your bedside table must look very intimidating to any visiting young ladies

...but hey, lube shows you care;)
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Unread postAuthor: Technician1002 » Tue Aug 18, 2009 9:23 pm

jimmy101 wrote:
Technician1002 wrote:The inspector will fail it. Neatness counts. In public view, I have been known to mask off the pipe with a wipe of grease to keep runs and dribbles from messing up the look. After assembly the grease is removed and the primer just comes out to the edge of the connection when done properly.

You can also use (blue) painters tape to mask with. It comes off clean without leaving any residue and gives a nice clean edge.


The primer being water thin tends to creep under the edges. I think it also dissolves the tape sticky. Maybe you have used a better brand than I have tried.

As an alternative, adding machine tape greased with plumbers grease can be simply wrapped around a pipe while the joint is assembled and secured with a rubber band. Then the joint can be pulled apart and primer applied up to the edge of the greased paper.

I have a wedding this weekend to do sound and videotape, so with preparations for that, It will be sometime next week before I can do a nice set of how to pics.

With care a pre soaked rag is not needed. The daubber works fine if it is blotted a little on a paper towel to reduce the drips.
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Unread postAuthor: FORE!!!! » Tue Aug 18, 2009 9:41 pm

In australia they dont sell primer with a (so called daubber) it comes with the same type of brush u use with ur blue glue pvc cement (a bristled brush) which is hard to keep neat unless u shake off the excess primer and then that is a waste of primer,u could also hold ur pipe vertically with the primed end on the bottom to stop runs..
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al-xg wrote:
I've used various things like cutting oil, silicone lubricant, even butter

jsr wrote:
This collection of containers on your bedside table must look very intimidating to any visiting young ladies

...but hey, lube shows you care;)
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