Inconsistant psi when spraying?
- This topic has 26 replies, 10 voices, and was last updated 14 years, 5 months ago by .
- Posts
[b]Rookie painter [/b]interested in learning how to paint like the pros…. Well about 8 years ago I decided to start painting my 94 nissan hardbody… Well as you all know I thought I was bad ass and could google everything so I went down to harborfreight and bought a 8gal compressor 5.5 cfm. and two paint guns, then to finish masters to buy exact honda accord 2000 taffeta white nh578 paint , so they gave me a butt load chems and paint all PPG. 700.00 worth , never the less I went to it. I painted the truck and it came out very crapy. Orange peel on the gloss and just a bad paint job.
Now, I have the two cars and a toyota sienna 2007 which my wife bangs up every day. And I need to repaint. So this is what I have now….
60gal 7 hp craftman compressor
sata 3000 digital hvlp gun with 1.3 and 1.4 tips and needles
And some BASF replacement paint.Question?
When I spray the sata 3000 digital gun the psi is 34 then drops to 29 or 28. How can I get a consistant 29 psi ? ALL THE TIME???
Please help this rookie.
Thanks
Well the gun will obviously drop pressure when the trigger is pulled. You adjust your pressure with the trigger pulled. Don’t pay attention to what the pressure is when it is not pulled.
Roger that… but When I pull the trigger the display shows 35 34 then just levels out at 29 or 30 psi… But shouldn’t it just always just be 29 psi stable? :huh:
How long does it take to go from 34 to 29, is it almost instant or a few seconds? Those digital gauges maybe a little sensitive. Play around with the dial to see if you can settle it on one number. Either way, if it jumps between 28 and 29, its no big deal
Yea just a couple of secs than just drops to 28 29psi. The compressor is set to 100 psi. So I guess I should be ok?? Thanks for your input.
Are you running hi flow couplers on the sata?? They can make a big diffrence for that pressure drop..
What size hose do you have, and how long is it?
make sure all your hose and fittings are big enough to supply the needed air to an HVLP (high Volume low pressure) High flow fittings and 3/8 ID air line.
I know you paid extra for that dig display but done rely on it. get yourself a good diaphragm regulator.Thats right,get yourself a good high flow diaphragm regulator and hang it on the wall. All of the instructors I have had in school told us not to have anything on the gun. It should be on the wall.
[b]Old DuPont Guy wrote:[/b]
[quote]Thats right,get yourself a good high flow diaphragm regulator and hang it on the wall. All of the instructors I have had in school told us not to have anything on the gun. It should be on the wall.[/quote]Thats the way I do it. Kinda nice not having the extra bulk of a regulator on the bottom of the gun.
What we have been told is to regulate pressure at the gun.You need the regulator on the wall to adjust correctly.Like we ever do but we’ve all been doin this for a while.The idea as I’ve been explained is that the cfm has to be regulated at the wall to the gun because the line has a tendency to bleed so many psi depending on how long it is.That’s what all the trainers say.Good luck!
I use Sata digitals so I look at my digi gauge while adjusting the pressure at the wall. The diaphragm regulator on the wall will stay consistent and i know exactly what I have at the gun.
You lose about 3-5lbs of flow pressure with a 3/8″ hose……….
Yea, the hose is a 25 ft 3/8. I am painting right now…. 🙂 Using limco white on a computer case trying to use my old harborfreight gun but with the 35 psi and the paint and clear looks way better… Thanks for all these tips. Hey when I shoot the paint two and tree coats, should it be glassy looking before the clear and then the clear coat? will that make it real glossy? I am shooting the second coat of clear. 20 min flash time.. Thanks
it should be a semi gloss for the base. as for the gun psi. i turn the dial on the wall up to 50-60 psi. then i use the air adjuster on the gun, turn that down until you see 29 psi. don’t look at the guage on the gun and adjust at the wall gauge. if you are that’s why your loseing the psi. wall gauge up high, adjust at the gun.
- You must be logged in to reply to this topic.