am i not cleaning guns properly or is my compresor not up to it?

[jamesmacc]

hey guys, got a wee problem and wondered what you opinion is. i have a 150litre 4hp sip compressor, kestral 3 stage filter and a air fed mask set up, i have my 1.4 spray gun connected to the spare outlet on the air fed mask belt. when i tryed to spray with it it would not attomise properly unless i put the fan adjustment to spot spray, so i pulled out my 2.0 nozzle primer gun and it worked great, far too much paint and i got runs but never the less it gave a good finish. i tryed removing the spray gun hose from the belt and tried running it direct from the compressor and it made no difference. i had a similar problem in the past with my old tired compressor, i was spraying water based paint and the flow kept cutting in and out leaving dry patches, i had a pro sprayer check all the parts and he couldnt find anything wrong with paint,filters,needle,nozzle etc, he also said i had it adjusted correctly. im wondering if the gun was damaged or if i maybe dont clean my guns correct. this is how i clean my guns,
after use i fill with a bit of thinners, shake it round the pot and then spray it through, i then clean the pot until free from paint and then fill it again and spray some more thinners through, then i remove needle and cap and soak in thinners, then rebuild with a little oil on the needle slide part. then i give it one final spray through with thinners and put it away.
the one that gave me the problem with water based was a fairly old gun that had been used for priming and was maybe a bit tired or blocked up, but my new sealey 1.4mm one that i mentioned has only been used once.
please let me know your thoughts, im tempted to sell them all and buy a couple of £10 hvlp guns on ebay as all my other guns are non hvlp

 

[Chipper]

If the 1.4 ran badly without the mask drawing air, it must be duff or blocked. Guess it's poss the nozzle is a bit blocked even after one use, if it was 2k.
Worth buying or borrowing another to try. I got one Sealey that's going fine a few yrs on but another was so useless I binned it.

I always strip the lot down, clean body, air cap, nozzle etc. Once 2k's cured it's not going anywhere.

HVLP mostly needs more air than conventional, so if it's a supply thing that's not going to help. But doesn't sound like it if it ran bad direct off the triple-pack or similar, without mask.

 

[norsa]

could be many reasons for not atomising as there are so many things to get blocked. Pulsing though is normally caused by a failed packing washer.
Nick.

 

[jamesmacc]

If the 1.4 ran badly without the mask drawing air, it must be duff or blocked. Guess it's poss the nozzle is a bit blocked even after one use, if it was 2k.
Worth buying or borrowing another to try. I got one Sealey that's going fine a few yrs on but another was so useless I binned it.

I always strip the lot down, clean body, air cap, nozzle etc. Once 2k's cured it's not going anywhere.

HVLP mostly needs more air than conventional, so if it's a supply thing that's not going to help. But doesn't sound like it if it ran bad direct off the triple-pack or similar, without mask.

yeh it was 2k, is it worth getting a cheap ebay gun to try it out? i was thinking of getting one of the 0.8 spot repair guns for doing alloy wheels,
the gun that was pulsing the first time was a devilbiss FLG, the guy i bought it off had it for years but think it was used for priming, came with 1.4 and 1.8 nozzle but only one needle and air cap

 

[Chipper]

I'd def try a different gun with the setup, borrow or buy a cheapie. If you get one similar to your 1.4 then you're testing the comp/filter setup generally works. Although, you're primer one works? so the systems basically OK.

But strip the gun right down, got to be worth a go, clean it all and try again. My JGA had 2k primer coated all the way through it, it took ages to get it shifted, though it had been there donks.