how to set up spray gun

got me a new one today from reduced corner of machinemart,
http://www.machinemart.co.uk/shop/pr...nt-air-brushes



save me messing about trying to remember what all the knobs should be turned to does some one want to roughly tell me?

stuff on the net say things like (set the regulator on the gun handle to 50 psi (what I use for DP40 and K36) with the trigger pulled and leave it set there. Close the valve at the bottom of the handle (on the gun, not the regulator) and then with the trigger pulled, open it to the point where the air volume starts to stay the same (just listen to it) and leave it there (it should be pretty far open at this point). I never mess with this after this unless I think it has been changed.)

so some thing a bit easier to understand please

oh am spraying bumpers with 2k

OK, well I find it confusing enough because in the photo, you don't appear to have a pressure regulator built-in to the gun (if you did, it would be at the bottom of the handle). You need to add this in the supply - either as a regulator on the compressor, or as a combined filter/regulator (better).

The knob on the side sets the fan size. It alters the air going to the air cap horns. If you turn this clockwise you get a small circle, and if you turn it anticlockwise, you get a large oval.

The knob on the back sets the amount of paint. The further 'out' (anti-clockwise), the further the needle gets pulled back when you pull the trigger. Basically, it acts as a stop for the trigger and prevents you accidentally squeezing it too far (and getting too much paint).

This is how I would proceed:
1. Set pressure regulator to 40psi (on compressor or on in-line filter/regulator)
2. Set fan size to 2/3rds of maximum
3. Adjust air pressure up or down to find minimum pressure that still atomises paint finely. The edges of the spray fan should be soft, not splattery.
4. Adjust paint volume so that centre of fan has desired amount of paint. Test-spray onto cardboard, reduce paint volume if runs are unavoidable.

If you are doing detail work, turn the fan size down. Generally you need the pressure as low as possible because otherwise you may ripple the paint if spraying close-up. Plus, having low pressure reduces paint mist blown everywhere.

-Alex

A very good informative answer up above
If I just add.

For starters invest in something like this and mount it close to the gun.
this is just an example,
http://cgi.ebay.co.uk/SMART-REPAIR-A...QQcmdZViewItem

The reason being, if you have a gauge on the compressor by the time the air gets through the hose you loose psi. as a result you can end up spraying at too low a pressure.
On a hvlp gun I usually spray a triggered pressure, as in the gun trigger pulled back (registered at the gun) showing 29psi 2 bar on the gauge. Although as above my guns have a regulator on the bottom of the handle

Make a note of the original settings. Have a few test sprays altering each knob and take note of the different effects.

what you planning to spray David?

I Fail,

whats 2k though? will it mean your bumpers will be better colour match?

2 pack type of paint

not doing my blue one am doing the mk1

rain stopped play today though

D'oh.

u not got garage or shed or living room (like i said in grumpy thread)

do you plan on re doing the blue 1 or not?

ot but blue one needs too much doing for a garden job

someone must be able to give u a dave discount surely

just say u will get ur business plugged online non stop

its 500 with dave discount whole front end 1 rear quater skirts n back bumper inc properly smothing bonnet, but i got more work needs doing since i got that price

got me one of them Spraygun Regulator with Glass Face Gauge, from machine mart for £7

hmmmmm, dave it would appear the tub needs a new wing......or two, fancy trying your new found skills out on them?

of course i doubt you could replicate the runs, paint brush, orange peel under paint bird **** effect....but you could try

i done what it says above but still dont think i got it right yet and i forgot to get gun wash so had to use 2k thinners and thats not cheap