spray gun please help

[brooker2008uk]

spraying problem please help


i recently bought a compressor and sealey gravity fed spray gun for spraying gates and railings. the problems i am having is that the paint is not coming out as much as it should do. for me to get it to spray properly i have to keep running my finger over the outlet pin and then it would spray well for bout 10 - 15 secs and i constantly have to keep doing this. i thought the problem was the nozzle size so i upgraded it to 2.0mm but the problem keeps happening. i am using proper paint for spraying and even though it said thin 20% i even thinned it 35 to see if it helps but no luck. i know the gun is only a cheap sealey one but surely it should work better than this. i have stripped the gun down and cleaned it all down with thinners but still no luch. has anyone any ideas on why i have to keep running my finger over to get it to spray right

it is a 290 litre compressor and i am runing it on psi so there is definately enough pressure getting to it , i am using ROURKES VINYLAST paint which is for spraying and seeing i have over thinned it, it should come out no bother at all in theory. i know it is only a sealey spray gun and i know there is a lot dearer ones on the market but for my work of spraying rails this should be good enough

can anyone please help me and tell me why i have to constantly keep running my finger over the nozzle to get it to spray properly. the gun has been stripped down and cleaned even though it is new

thanks

 

[Paul.]

Is the vent clear in the paint pot lid, in order for paint to come out, air must get in, its only a pinhole and easily overlooked.

 

[brooker2008uk]

yes i even put new filter in it. someone told me to strain the paint but is this necessary if there is already a filter/strainer at the bottom

 

[Paul.]

Try blowing some neat thinner through it and see if it sprays consistently, also check the needle packing, on a cheap gun is probably just an o ring but it will suck air instead of paint if its leaking.

 

[brooker2008uk]

i always blow neat thinners through after use and its ok

 

[chrisg3103]

its very important to strain the paint before it goes in the gun, i spray teflon at work.
if im in a rush and just pour it straight fromt the tub 9 times out of 10 the gun clogs up with a teeny tiny bits of crap and i need to strip it and clean it. not neceseraly dried paint, but bits of goo that get sucked in and clog the needle. like you say if you wipe away the goo then it sprays for a few seconds till the next lump gets drawn in

moral of the story - failing to prepare is preparing to fail, takes more time in the long run

 

[jaykay]

it could be the vinyl paint skinning up be for it leave the gun.are you sure you have the right thinners?
why vinyl paint on gates?,i used to spray vinyl,but it was on perspex signs.
maybe too much air.Drying it too fast.

 

[jaykay]

ok i just looked at website for it your gun is ok.
i would give them a call and ask a few questions,along the line of air pressure.

 

[brooker2008uk]

so should i notice big difference if i strain it.

 

[brooker2008uk]

also forgot to say that when i run water through it. It works completely fine

 

[bawjaws]

you shouldent run water through it, you need a special gun for water based paints ~(expensive one) only run pure thinners through it to clean it afterwords, this may be the problem, bad reaction to the paint mabee?


oh and chris, what do you use to strain the paint, couldent find anything to do it before that would let the paint run through and still filter it

 

[brooker2008uk]

so would straining the paint cure the problem even though there is a filter strainer at the bottom of the cup

 

[chrisg3103]

cant hurt, i use a fairly coarse looking strainer. bit like a fine sieve, not the filter paper types
the teflon flows fine till the gunk gets caught in it and the whole thing blocks up and you need to keep rotating it to get a clean bit thing is its not obviouse that the paint has congeled bits till you strain it.

have you tryed to blast any muck out of the gun while spraying? open up the feed and crank up the pressure, sometimes blows out the crap enough to finish a job. as said before its a very fine tollerance so dosnt take much, i hate spraying

 

[jaykay]

are you thinning &mix well be for straining?

 

[brooker2008uk]

i have strained it this morning and got strainers and thinned and mixed it well and elt sit for half hour and it seemed a bti better now. only thing is that when i started getting to the end of the tub it started clogging up a bit

 

[Afterimage]

I have a cheapy "Wolf" 2hp 50L compressor and Machine Mart's £20 "professional" spraygun and following their instructions I could hardly get any paint to spry forth.

I ended up doubling the air pressure from recommended 30psi to 60psi and using 60% paint and 40% thinners to get the job of painting my Land Rover done.

I'm guessing that my problem was that all the equipment I'd bought was just crap.

 

[jaykay]

mickj,you dont say what paint your trying to spray,some paints will take up to 50/50 mix
Brooker, i beginning to wonder if your using old paint,if its been down to freezing point,theres a good chance its past it's sell by date,so to speak.
try spraying at differant pressures see if tha help.
try not to trigger off to early as it sound like the paint is drying at the tip,triggering air could be doing that.

 

[Chipper]

Mick if it was synth enamel (normal Landy fodder), some of mine's very gloopy so thinning as instructed wouldn't work at all. Just a thought. Sort of like milk or thereabouts should be OK.

 

[brooker2008uk]

well the paint i am using is definately not old. it is ROURKES VINYLAST BLACK GLOSS and was bought new

 

[Afterimage]

Mick if it was synth enamel (normal Landy fodder), some of mine's very gloopy so thinning as instructed wouldn't work at all. Just a thought. Sort of like milk or thereabouts should be OK.

Yes,it was synthetic enamel.
The directions on the tin said add 30% thinners but I guess I was never sure that it meant 30% of the amount of paint,or 30% of the total mix of paint/thinners.
I just keep adding the thinners until it looks right - like milk as you say.