Close ups of primer coat reveal stuff. Couple questions

[Citadelgrad]

I airbrush in my garage.  Its clean but not a clean room. 
 

i just posted up photos of my primer coat, which i laid down with a new Iwata i picked up today. 
 

to my dismay, there appear to be dust, etc in the primer coat. 
 

 

although a new airbrush, i dont think this was spitting.  I think dust landed on the model?   Either way, is this something that i can polish off with very fine polishing pads? 
 

i washed the model before painting, and i looked at it under the optivisor before i painted, it was SMOOTH.  
 

i also thinned the primer with mr self leveling primer at about 30%, even though its a no thinner needed primer.  The tip stayed clesr the entire session, but i was spraying for quite a while. 
 

ideas?  

[Iain]

Fairly normal - nothing a quick go over with some fine (1200 grit) wet and dry paper - or Micromesh pad - won't easily fix.

 

Iain

[Panzerwomble]

Hard to say if dust or a bit orange peel - where the paint has dried to quickly and not flowed out in time . I'm guessing its hot in South Cal . 

 

As Iain says a quick fix, you could even gently use a kitchen sponge scrubby with some water to level it down . 

[chuck540z3]

Totally normal as mentioned above and it's due to dust particles landing on the paint.  No big deal at all- just sand the crap off with fine sandpaper or fine sanding cloths.  It will come out out a bit streaky looking but since it's a primer coat, you'll never see it after a first coat of the primary color, which will also likely attract more crap.  Sand it off too and spot paint, which can turn into a never ending repair session, but in the end, worth it.  Without exaggeration, I might take 30 trips to the spray booth to get my paint finish looking flaw free.

 

Cheers,

Chuck

[Woody V]

I'm not sure what primer you're using but this is why I tossed all my water based paints in favor of lacquer.

 

[Paul2660]

I would consider 0000 steel wool wet. Works great of this type of problem. 
 

Paul 

[nmayhew]

i think to get a better idea we need to know what primer you are using, what psi, and how far away you are spraying, are you wet coating etc etc

[Treehugger]

My guess is that, the dust was there on the model before you started spraying. So, I am thinking the dust that was already there got sealed with the layer of paint. I believe I've seen something like that before, but with a hand brushed model.

Edited August 26, 2021 by Treehugger

[John Stambaugh]

Sanding dust will certainly be deep inside the thin crevices where you just can't reach with a toothbrush. 

 When I get ready to paint I always blow out these areas with  a shop compressor and soft tip blow gun with modest air pressure. 

Your airbrush at 10- 15 psi stirs up that dust which them lands in your wet paint.

[thierry laurent]

Static electricity is a common issue with plastic... Very probably this can explains the problem.

[europapete]

As Thierry says, probably static attracting the dust. Wipe the modal down with anti-static cloths/wipes before painting. Any automotive paint store stocks them, and they are not expensive for a big box full. Regards, Pete in RI.