September 12, 2014 at 8:16 pm #47355
Ok. I have a few questions for any LPH400 users out there. I’ve been told that when spraying basecoat that I should set my inline gauge around 16-18 psi. I did and the mottling virtually went away. But the base looks like it comes out kinda textured.. Is this normal? Another paint rep(not mine) swears I should be pushing like 28 psi. The second question is about air caps. I accidentally (while spraying a practice panel) used my LVB Basecoat air cap to spray my clear. I’ve been having a hard time with orange peel but the clear laid out beautifully at 26 psi with the LVB. I even fooled with many different psi with the LV4 clear air cap and it’s always more peel than the lvb was. My only concern about using my lvb for clear mil thickness? I am using a cheaper clear but I’m not spraying high end cars. And lastly (for now) , is there a really good in line psi air gauge out there? Maybe digital? Any help or reply is greatly appreciated.September 12, 2014 at 8:28 pm #47356
Not sure if the textured base coat question would be affected, but I spray ppg Deltron DBC (SOLVENT) .September 13, 2014 at 4:32 am #47360
Im not an lph user but I do know these guns work better at a higher pressure than advertised.I would put money on it that if your basecoat is really textured you are not getting enough atomization to your base (air pressure too low) I would try full controls with 25psi and see how it does.September 13, 2014 at 4:34 am #47361
I use my LPH 400 for clear so I cant help with your basecoat issue.
But with clear i spray it around 20-22psi full trigger. Remember, these guys have a large pressure drop between half trigger and full trigger.September 13, 2014 at 4:48 am #47363
I set my pressure using an inline regulator at full pull wide open and fluid coming out. I don’t know how accurate the gauge is on the regulator. I want to invest in a really good one. Any suggestions? I sprayed a test panel today at 16-18 psi and it seemed a bit textured. I also bumped it up to 26 psi and it was SO mottled. Even though at low pressure it went on textured it looked really good after clear. Adhesion is my only concern here??? I might try a sata or devilbiss (spelling). In the future. I hear some spray the lph400 gun at 12 psi. Thanks for the input guys. I read the specs but it doesn’t seem rightAttachments:September 13, 2014 at 5:07 am #47366
Man those are some low pressures,I would be tempted to try 22 for base and 25 for clear.I have also heard the silver cap is a general workhorse,but have not used them.Jimmo the site owner has used an lph for a long time so maybe he will jump in.September 13, 2014 at 5:56 am #47367
Yeah I think I’ve watch all of his videos and I noticed he uses this gun often but he mostly sprays waterbourne I believe. Not sure if that makes any difference in psi? I would love to get his input on lph pressures though. The textured spray was wet in nature so no color on my tack cloth. And it was Omni I was practicing with. I don’t remember seeing the texture with deltron. I’ll have to keep playingSeptember 13, 2014 at 6:00 am #47368
Jayson M? Do you use an inline regulator or know of a good accurate one on the market? I was running an inline water filter also between the gun and inline regulator but I took it off just in case it was messing with my pressures. We have an industrial air dryer anywaySeptember 13, 2014 at 7:02 am #47369
I have had very good luck with sata and devilbiss gauges/regsSeptember 14, 2014 at 1:37 am #47371
Ok….. I think I finally realize what’s going on with my mottling problem. The lph 400 is a low pressure gun and today I resprayed a chevelle and realized that the paint booth fans are so strong it’s (BENDING) my spray fan. I sprayed the hood with the booth fan of and BAM!! No mottling. I’m not able to change the booth flow , SO,,,,, any recommendations on a higher pressure spray gun that you guys prefer? Sata? Devilbiss?September 19, 2014 at 3:34 am #47412
You shouldn’t need any more than 16 psi when shooting base. If you are having problems with your base mottleing, make sure your using the correct speed reducer. I know some guys will have problems getting Sherwin Williams to lay right. It atomized it to much. For your clear try setting your gun to about 22 with the trigger fully pulled, about 5 in from the panel. Iwata has a forum that you can go on and they can give you alot of tips on gun adjustment.
ChuckSeptember 22, 2014 at 6:49 am #47433
I am only having this mottling problem with what seems to be old 60’s metallic colors. Pearls don’t seem bad. I sprayed my last car at 28 psi for clear and it laid beautiful. I sprayed the same green with my cheaper touch up gun on a practice panel and it seems to lay ALOT darker? I’m actually thinking about a sata RP for baseOctober 11, 2014 at 12:07 am #47570
I have a LPH300 1.2 with an LV4 aircap and fluted nozzle ,it runs nicely at the recommended 14 PSI for base,its fantastic for silver blends ,these are dynamic pressures ie fully triggered inlet pressure and should in effect let the aircap pressure run at 10PSI or below ,so yes they may seem low when compared to the recommended HVLP inlet pressure for say a Devilbiss GTI or Sata HVLP which is 29PSI but what comes out the aircap is still only 10PSI with those guns as well ,Iwata guns may just be designed differently and convert the inlet pressure in a different way to most other brands of HVLP conversion gunsOctober 11, 2014 at 10:50 am #47577
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