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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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pvc primer help

Unread postAuthor: roughboy » Mon Aug 17, 2009 5:44 am

It's late night and all the hardwares are close and i want to complete my gun but too bad im out of purple primer. the only thing i still have is pvc cement so could pvc cement work alone without the primer?
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Unread postAuthor: jmadden91 » Mon Aug 17, 2009 5:46 am

What are you building?
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Unread postAuthor: FORE!!!! » Mon Aug 17, 2009 5:53 am

Try, mineral turpantine,methylated spirits,rubbing alcohole and make sure the fittings are as clean as possible..(dry the oily residue if using turpantine)

regardless of weather you use primer or not it will still cement together,..

and work !!!,,use heaps of glue and let it dry for an hour
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Unread postAuthor: inonickname » Mon Aug 17, 2009 7:03 am

This is rubbish advice guys. Come on, don't give advice if you don't know what your saying. Unsafe. Only way to put it.

There are solvents (eg. a mix of methyl-ethyl ketone and acetone) that could be used as a substitute for primer, though if you can't get your hands on primer then those aren't looking too good.

Just wait until tomorrow.
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Unread postAuthor: jmadden91 » Mon Aug 17, 2009 7:33 am

inonickname wrote:This is rubbish advice guys.


Guys? I didnt give any advice. I would only have condoned not using the primer if he was building a simple combustion. Anything more and it is obviously, very unsafe. Thats why I asked what he was building before making an assessment.
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Unread postAuthor: dewey-1 » Mon Aug 17, 2009 8:06 am

FORE!!!! wrote:Try, mineral turpantine,methylated spirits,rubbing alcohole and make sure the fittings are as clean as possible..(dry the oily residue if using turpantine)

regardless of weather you use primer or not it will still cement together,..

and work !!!,,use heaps of glue and let it dry for an hour

The bolded portion of this statement is more dangerous than the use or non-use of primer!

Do not use launcher or pressurize it until 24 hours after cement application!

The safest approach is to always use primer, cement and allow 24 hour cure time prior to use.

Haste make waste and possible injuries!
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Unread postAuthor: inonickname » Mon Aug 17, 2009 8:31 am

jmadden91 wrote:
inonickname wrote:This is rubbish advice guys.


Guys? I didnt give any advice. I would only have condoned not using the primer if he was building a simple combustion. Anything more and it is obviously, very unsafe. Thats why I asked what he was building before making an assessment.


You have a point, but I wasn't referring to you specifically (obviously).

If it's only one or two fittings how about epoxy?

Seriously, just wait, buy primer, and give it the full twenty four hours.
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Unread postAuthor: jmadden91 » Mon Aug 17, 2009 8:40 am

lol sorry mate just didnt want to be roped into supporting rubbish advice hahah
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Unread postAuthor: inonickname » Mon Aug 17, 2009 8:47 am

No problems jmadden.

mineral turpentine,methylated spirits,rubbing alcohol


And also, you've just rattled off a list of chems which you have no clues for incompatibilities or risks. Also, these are completely unsuitable as primers. Methyl-Ethyl ketone and acetone mixture should be used.

You do understand the function of primer don't you?
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Unread postAuthor: FORE!!!! » Mon Aug 17, 2009 8:59 am

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???

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 ,installing pressure lines ,i usually give it half an hour before turning on the pump to 800-1000kpa water pressure,the only time i get a leak is when the apprentice glues a fitting

@roughboy what exactly are u building ? :x :shock:
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Unread postAuthor: inonickname » Mon Aug 17, 2009 9:07 am

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???


Jesus, I hope you haven't used epoxy before.

Rule of epoxy:
Sand surfaces first.

1000kpa

Do you say that to make it sound like a lot, or because you don't know a common measure? 145 Psi.

water pressure

Water does NOT compress, and therefore stores substantially less energy than gasses at the same pressure.

can i ask why u would recomend using epoxy over cement??

Given the context, I'd have thought you would realize I was talking about without primer.

half an hour

Even though the container specifically states at least twenty four, and to use a suitable primer?
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Unread postAuthor: FORE!!!! » Mon Aug 17, 2009 9:34 am

Quote:
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???


Jesus, I hope you haven't used epoxy before.

Rule of epoxy:
Sand surfaces first.

yes ive used epoxy before ,still dosent answer the question tho regardles of weather its been sanded or not ,why would u recomend it over solvent cement??? if its just a few fittings to glue?


1000kpa this unit of measurement is what modern day plumbing schools use, its only after coming to spudfiles have i had to convert to psi to fit in

like how lot of people on here use inches, i was taught to use mm/cm
which again is modern day schooling ,i cant believe people still use feet and inches on here, didnt they change the old system from metric to imperial or something like that 20 years ago?

anyways ill shut up now,peace mr nickname




:)
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Unread postAuthor: dewey-1 » Mon Aug 17, 2009 9:44 am

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 ,installing pressure lines ,i usually give it half an hour before turning on the pump to 800-1000kpa water pressure,the only time i get a leak is when the apprentice glues a fitting


This bolded statement indicates to me that you must not understand that a lot of new members or those unfamilar with pneumatic launchers are even less skilled than your so called apprentices.

Would you use a pneumatic launcher at 150psi that was cemented 30 minutes ago by one of your new apprentices that have never heard of PVC cement before?
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Unread postAuthor: FORE!!!! » Mon Aug 17, 2009 10:00 am

yeah i understand that and no i would not touch a launcher that i didnt make myself,within reason..

but if it was a combustion spray and pray then yes i would use it after 30 min altho its probly not recomended..
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Unread postAuthor: jimmy101 » Mon Aug 17, 2009 11:02 am

FORE!!!! wrote:... 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 ,installing pressure lines ,i usually give it half an hour before turning on the pump to 800-1000kpa water pressure,the only time i get a leak is when the apprentice glues a fitting

Sure hope you aren't installing pressurized water systems in homes and buisnesses. Last think most buyers want to have to do is rip out all the PWS system and redo it in a completed building because it wasn't done to building code.

Glad I don't work in whatever shop you work in.
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