Spray gun misfire.

[SR_Neale 10]

When painting my bonnet this after noon I noticed it seamed to have some sort of misfire leaving dry patches. Has anyone else come across this? I use an air feed mask and have a 150l compressor. Any advise would be helpful. Cheers

[sexybourbon 0]

Paint to thick ?? Try thinning it down and adjusting your guns pressure , what gun is it and is it hvlp

[SR_Neale 10]

Devilbis gti. Tried it at 10% 20% and 30% thinners. Have drained all the water messed about with pressure fan size, adjusted the nedal. But still the same. If I had hair I would be pulling it out right now.

[VW_OwneR_85 1]

possibly paint to thick for what size fluid tip your gun has, have a look at the technical data sheet for the paint your using and see what it says for what size fluid tip is needed for it, you can also see how much the paint can be thinned down by, you did make sure the internals were clean and debris free before you put paint in the gun? all ways check the needle air cap and inside is mint!, are you still using the little filter that sits at the bottom of the cup? if so then ditch it! all ways use a paint strainer when putting paint in the gun that way nothing other then decent paint gets put in the gun, any air flow restrictions to the gun?

[SR_Neale 10]

Tip is 1.2 I think but also got a devilbis primer gun which is also doing the same thing. Have kept my eye on the pressure and the is no dip. Happens consistently every 3-4 seconds. Tried with and without the filter and always use strainers. Also the only thing in my workshop that is clean are the guns. Lol. And if I thin the paint down any more it will be to **** thin. Could it have any thing to do with hoses air fed valve?

Edited June 1, 2015 by SR_Neale

[VW_OwneR_85 1]

if its happening consistently with both guns then it could be an air supply issue, you might have to up the hose bore size to the air fed belt , im guessing your paint gun hose comes off the belt? so you got one hose the feeds both the gun and mask?

[Pete b 10]

Are the Air holes in the pot lids clear? If they're blocked it can have this effect. Simple but worth a look.

[SR_Neale 10]

Vw_owner yes that is the set up I'm using. Does that mean larger diameter hoses and connectors? I have one hose 10m from the compressor to a water trap and a 20m hose from water trap to belt. Would both need replacing? Will check hole in pot lid first though as that sounds alot cheaper.

[VW_OwneR_85 1]

cant say for sure but its a good place to start, maybe run the guns without the mask and see,

[Pete b 10]

If it was a pressure problem this should show up on you gauge, pull the trigger and watch the gauge if it's not fluctuating I would say your air supply is ok.oh and always make sure the cap on the lid is pulled up agen simple but easy mistake.

[SR_Neale 10]

When you say the cap in the lid should that not be pushed into the hole? Long time since I did all this in college.

[Pete b 10]

No you should pull it out say half way so it's still on but lose so air can get in.

[SR_Neale 10]

Will give that a go next time I'm doing some painting. Cheers