Attention Spray Painters!

**geodon** · 14th February 2015, 10:35 AM

I'm painting my Pug wheels & have struck a problem I've not had before.

The gun is a gravity feed unit.

Spraying grey primer with 10-20% GP thinners.

Air pressure 25-30psi.

With paint in the gun, no air, trigger depressed, paint comes out in a steady dribble under gravity.

Hook up to air, lovely full, wet coats for ~60 secs then the feed starts to falter. 60 sec more no feed. Air off, trigger depressed, no paint.

I tip out the paint, add thinners, swirl, depress trigger (no air), thinners comes out.

I start again with paint & get the same result.

It's almost as if the paint is prematurely going off in the gun with the air.

I've always used 25-30psi. Any more causes runs.

Comments?

**geodon** · 14th February 2015, 10:37 AM

Der! Sorry 'bout that!

**blue_mini** · 14th February 2015, 11:02 AM

Its not etch primer is it? Need to thin etch primer with acetone.

**geodon** · 14th February 2015, 11:26 AM

Yes, BM, it's etch primer & the paint shop said to use thinners GP

**Corgie Carrier** · 14th February 2015, 11:29 AM

I usually use 45-55psi and hold the gun about 30cm from the job. If you are getting runs you need to move faster or hold the gun further away.
If that doesn't work, I have no idea. the paint shouldn't go off in the gun unless it is old paint or the wrong thinners.

**blue_mini** · 14th February 2015, 12:23 PM

Reason i ask is I was having the same problems, paint would go off in the gun and clog up the filter. I have a gravity gun as well, probably running 50ish psi or so though.

That was with concept paints etch primer a few years old so went and bought a tin of dulux etch primer and read on the back to thin with acetone, did that and came out lovely. Wouldve been 6 months ago i did that over cold gal and the top coat hasnt shown any signs of anything bad.

**geodon** · 14th February 2015, 01:37 PM

I went up to 40psi with etch primer & got the same result!

After struggling through, I changed to colour (acrylic lacquer) diluted 50% with GP thinners & it went thru perfectly with good results.

**Corgie Carrier** · 14th February 2015, 02:03 PM

Like Blue mini said it sounds like the wrong thinners.

What does it say on the tin of etch primer you have?

**DoubleChevron** · 14th February 2015, 03:28 PM

I doubt it's the paint ... check your air breather on the cap and remove the stupid filter between the gun and pot. Just unscrew/remove the breather on top of the pot for starters (don't tilt the gun too fun an spill paint out) and I'm sure you'll find it works fine.

Get the feeling I've "been there and done that" many times

BTW: I'm NOT a painter, I'd just someone that tinkers in there shed.

seeya,
Shane L.

**geodon** · 14th February 2015, 04:51 PM

Originally Posted by Corgie Carrier

Like Blue mini said it sounds like the wrong thinners.

What does it say on the tin of etch primer you have?

The tin says: "Before starting refer to data sheet 426." Gee, thanks!

But I bought the primer & asked for the thinners. GP is what they sold me.

The weird thing is I used black etch primer for the Dauphine engine which is dark green & it worked fine with GP. The Pug is light green so I got grey etch primer & it didn't work.

I'll consult the guru Monday.

Thread: Attention Spray Painters!

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Attention Spray Painters!

Aw Shoot! SPRAY painters! I can't edit the title.

I think BM wins the cigar.

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