Can i thin primer that is using a hardner. I m using urethane primer and it is laying down ruff and seem really dry. I using a Omni primer and paints. if so what type thinner do I use .

thank moose:confused:

You should PM cali_surfer. I bet he would know. My guess is that if it is drying out then you probably need to use less thinner or a higher temp range. Just guessing.
Ben

Check the breather hole in the top of your spray gun to make sure that it isn't clogged up.

Mix it according to the directions on the label or tech sheet. You don't want to stray too far from these measurements because all this paint stuff has specific chemistry involved. If its going on rough there are a couple simple things to check. Whenever you spray something with a paint gun, always pour it through a paint strainer into the cup of your gun. This will trap some of the gummy particles that might clog up the tip. Regulate the air going into the gun. If its an HVLP you want 10 psi at the cap. When I spray paint with my Finishline II, the manufacture recommends setting the regulator to read 23 psi with the trigger pulled. That translates to 10 psi at the cap. May sound confusing, but break out the instruction sheet that came with your paint gun and check for specs like that. Use the next higher temp reducer for the product you're spraying. That trick really works good for me. If the temp is 75 when you're spraying, using an 85 degree reducer will let the material lay down wetter. And, finally, don't move your arm so quick. If the material doesnt go down on the panel wet, it will tend to be rough. Hope all this helps.

Had the same problem. I listened to the paint gurus on this list and did the following.
Using a conventional gun. I turned down the air. Then I moved my arm slower. BIG difference. Didn't change the mix ratio on the reducer.