I'm using a Kremlin air assisted airless to spray conversion varnish. I'm trying to determine what is causing the random bumps in the finish (see photo).

I've strained the finish, filtered my airline and don't seem to have dust in the air either.

I tried spraying a clean piece of glass to rule out surface contaminants, and I get the same results on the glass!

I'm not sure what else to look for. Any suggestions would be appreciated!

Wipe clean with your hand before you spray
Adamo

I tried wiping with a tack cloth and still have the problem.

I am no finisher and it doesnt speak to your glass test, but when we have that issue thats apparent in a corner, its trash in the environment thats either on the part or somewhere in the technique that is getting laid down/blown down.

Is it predominantly in the corners? Does it happen out on a wide open panel as well?

No, it doesn't just happen in corners, though that's where it is this piece. its very random, and happened even on flat pieces. I don't know if my gun has junk in it that's coming through it or what. i have been spraying all year, and didn't have this problem this much, though I did have it on some occasions.
I did notice tonight that some small flakes of dried paint fell off my either my gloves or paint suit, so i'm trying to watch to see if that's my problem.

Raymond, Did we talk about this about a year or more ago on the phone? I would like to see the bumps under magnification. This will tell me what it is.
There are lots of dust inclusions in that corner and surrounding area. I also see some small fiber fuzz. Do you spray near your spray booth filters? Do you spray on a spray table where some old overspray could be "kicked up"?
Take some finish, pour a puddle across the top of a piece of glass and then stand it up so it runs down. If that has junk in it then you know it is not from pump and is in the finish.
Keep us posted!

My guess is dried finish falling off of your gun/hose/trigger.

Wipe clean with your hand.
You can’t feel the crumbs with a tack cloth.
Spray tack coats.
Adamo

Thanks everyone! i will try the things you mentioned and post what happens.

Ok, so I played around more with this today, and still getting the same results. I did notice when i sanded the last coat of finish (the one i pictured a few days ago), that there are also small craters in various places. So i'm thinking i'm getting some kind of contamination through my sprayer. Would that be a possibility? Or to many air bubbles?? It seems to be random, and some pieces spray are worse than others. I get the same results when i spray over cleaned glass. I'll post a few more pics for you all to analyze.

View higher quality, full size image (4096 X 3072)

View higher quality, full size image (4096 X 3072)

View higher quality, full size image (4096 X 3072)

i'm using Chemcraft aquaprime for primer and their CV for topcoat. Anyone else here use Chemcraft? i've also been hearing a lot about Milesi products. Maybe i should consider trying another product?

Actually, in this case I'm remembering I used the Chemcraft Plastiprimer (solvent base) for primer.

We stopped using the Aquaprime a few months ago. My finisher was pending to much time straining the crap out.

MLC has a new WB primer that is much better than aquaprime.

Yes the stuff has to constantly be strained!
What is MLC? And is the adhesion good for refinishing cabinets?

Is that agualente from ML Campbell?

Its called "Universal WB Primer" they just came out with it to compete against Aquaprime. Ask your rep