compressor pump

the short answer is no it wont let you paint without kicking on.
you should not be seeing any pressure drop when it kicks on either. the kick on point pressure is far higher than your spray pressure .
If you have a decent regulator you should never see a fluctuation at the gun.
If you want to paint without any kick on you will need a very large tank, as that is where the volume of air is at.
I really don't think you want a 500gal air receiver!
A true 5hp motor with the pump you have indicated should work nicely, but it will stick kick on during spraying.
 
thanks SOF, when my tank is full and the pump is off, i will have the pressure at my gun at the recommended psi (usually 28 psi)
my wall regulator is open all the way at 120 psi. when i start spraying about 1/4 to 1/2 way thru making my trip around the car (69 camaro minus front end sheetmetal) the compressor kicks on and i notice that my psi has dropped 3-4 psi at the gun.
 
btw my setup from the tank is 1/2" iron pipe to a motor guard MC-60 filter then to a 3/4" flex line to about 15 feet of 1/2" iron pipe with drop offs to a devilbiss QC3 dessicant filter then another motorguard MC-60 filter then the diaphragm regulator to a 25 foot 3/4" air reel all connected with automotive style fittings.
 
What are you using at the gun to read the pressure - one of those fancy Sata's or some sort of gauge?

How are you regulating the air pressure to the 28psi?
Is it with a diaphram regulator or some sort of valve?
I suspect you might be using a valve as that would not compensate for pressure drop, you would see an almost linear drop at the gun as the pressure drop in the tank.

A good working diaphragm regulator will compensate for the inlet pressure changes and keep a constant output pressure ( within the regulators design ability).

Take a look a this " air regulator" - nice brand name, but in parentheses it says air flow control which is what it really is, not an air pressure regulator. http://www.tcpglobal.com/AirbrushDepot/ItemDetail.aspx?ItemNo=IWA+8131&gclid=CJP6w5CYz7wCFQ-DfgodGUsA_Q]Iwata "regulator"[/url]

Now take a look at this air regulator, notice it says pressure regulator and has a diaphragm, this is the only correct way to control air pressure at the gun as the supply pressure varies.Air regulator
 
Yes my gun is the digital model
This is the regulator i am usingbthat came with the filter image-508422991.jpg
 
I would try regulating the air right at the gun.

Other than a regulator problem I cannot see why you are experiencing a 2-3 psi drop as your tank pressure drops, unless it doesn't kick on until 40, all those valves fitting and devices are all causing pressure drop.

Do a dry run, hook up your gun and just hold the trigger wide open , watch the pressure gauge and the tank pressure and see at what tank pressure you start loosing gun pressure.
What ever the pressure is at the tank when you see the pressure START to drop at the gun is the pressure at which you compressor needs to already have kicked on.
At what pressure will the compressor maintain with the spray gun held wide open?
 
i will have to try that out
i know that the tank fills up and stops at 145-150 psi. and then kicks on around 100 psi
should i keep my gun regulator wide open and use an add on diaphragm type?
my pump is getting old and definitly overworked and with all the sandblasting i do and painting a larger pump seems to fit the bill
 
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hmmm. If the compressor kicks on at 100 you should never see a drop at the gun. I "think" that the regulator you have is not working correctly. Bypass it and put a regulator at the gun and see what happens.
Either that or you have one hell of a pressure drop before the regulator and it is only seeing marginal flow and pressure.
I agree, a new bigger compressor is always a good thing to want for!
 
Im gonna do some tests and report my findings this thursday if its not gonna snow. Then ill be shovelin
 
When I open all of my tanks I have about 400 gallons and if i'm doing a big paint job mine will still kick on once in a while..
I usually only run at 160 gallons though since the other tank is in another building tied together underground.
I have to admit though, I do love having a large tank capacity.
 
wow 400 gallons of air
makes me feel tiny with my 60 gal lol
with those to M60 filters i have, someone mentioned i dont remember if from here or team camaro but they said that instead of spending the $15-20 for a new filter element, you can use regular unscented toilet paper. i have been doing this since but could it be possible that the toilet paper is denser therefore restricting airflow a bit more?
just a thoght
 
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