Hey guys , just got into airbrushing a F-4 phantom kit with a H&S evolution with a .4mm nozzle and needle , and a pressure of usually 1.5 to 2 bar , my main issue is when I shine a torch on my model at an angle , I always see the finish looks rough or coarse I use Stynlrez primer which has arround 3 drops thinner and mixed well , and sprayed on the kit until the paint looks wet , the funny thing is I am baffled by whats causing this , as my first time i remembering it happen was with my first airbrush (chinese no brand) and a different compressor , which both my airbrush and compressor have changed since then and i still get the affect , i spray close but not too close , maybe 3 inches or so away from the piece and vary my motions by maybe moving in circles or going up and down , but mostly just left and right , its been a year now and i still dont know whats causing it , but i really want to solve this once and for all.