Underseal gun for Waxoyl?

[droopsnoot]

I've got a cheapo underseal / Schutz gun from Toolzone, the type where you screw the can onto the bottom. It works just fine for that, but I've now come to a point where I want to put some wax in bits. It pre-dates the ones that come with a plastic extension hose, but a mate gave me a spare hose with the nozzle on the end and I've adapted it to fit on the end of the fixed outlet.

But, when I do that, even though the wax is quite thinned down and warm, nothing comes out, in fact nothing even seems to go into the plastic tube. The tube isn't blocked. I also tried a short piece of some other plastic tube that has no fitting on the end, just to spray some in the end of the sills, and again nothing happens. When I take either of them off, it sprays just fine.

Is there some difference between the guns that can have this extra tube and those that cannot? It just seems a bit weird that with no other difference, as soon as I fit the plastic extension on, nothing comes out. Is this some weird venturi thing that needs a different gun to work with the extension, or am I overthinking it?

I don't mind buying one that does have the extension if I know it's going to solve the problem, they're not expensive on eBay at around £12, but I'm having a bit of a clearout of old junk and the last thing I want to do is buy a duplicate if it won't help.

Any advice would be appreciated.

 

[droopsnoot]

Ah, it seems as if the issue is indeed adding the probe to the can-type spraygun, if I've read this thread correctly: http://www.mig-welding.co.uk/forum/threads/cavity-wax-spray-guns.77805/

 

[neil1468]

is the output nozzle adjustable ?
mine is ,sprays underseal, stonechip, warmed or thinned waxoyl ,no problems??
neil

 

[droopsnoot]

No, the nozzle on mine is a fixed pipe, internal diameter is probably about 6-7mm. By contrast the thread on the fitting on the end of the flexible pipe I was given is a little smaller - small enough that I could push it into my tube. I wonder if the larger diameter is what's causing the problem.

 

[graffian]

I think the nozzles on all my schutz guns are 1/8bsp, I have a plastic hose barb as a nozzle on one of them.

 

[droopsnoot]

It might be that for the rest of the car I can just use the short tube that's on the end of the gun. I was just pondering on why adding a short length of plastic tube (wider than the original fixed tube, so not restricting airflow really) it doesn't pick up. I can see that adding the smaller one might do that.

I'll have to clean the manual one out again and have a go with that. The biggest problem with it is that it's been kept coiled up in its box since I used it on the last car (in 1997) so it just curls up all the time. I've got it pegged out straight at the moment in the hope it'll make it more useful.