Originally Posted by steamgoat
The OP's question asks about 'two part poly' So this is not necessarily LPU [Awlgrip ] It could also be Acrilic Urethane [awlcraft 2000 or Imron]
Minaret,I always read, and believe you advice, but, whats the problem spraying acrilic urethane with HVLP ? It is common use for autos and they also dont want orange peel. Just curious, Bruce.
Having shot a lot of both with both systems, that's just the opinion I've formed. It's certainly not impossible to get a good finish with HVLP systems, turbine or otherwise, I just find it much easier to get a truly exceptional finish with conventional gear
. Just don't tell the EPA, please.
I find when I am forced to shoot with an HVLP rig I tune it so it's not HVLP anymore. Read up on suggested air cap and pot pressures for shooting Awlgrip and you may see why. You want to dial the air cap pressure way up to provide a very fine film. Over the recommended numbers even. That's what works for me, and I think you may have seen some pics of the finish we achieve this way. Of course it does dramatically increase overspray, which in turn increases wastage and need for safety gear
, as well as masking and filtered air control. This is one of the differences between a pro job and an amateur one, we have the infrastructure to do it right. For the average person it would be prohibitively expensive to use this sort of arrangement, and you would have a very difficult time doing it this way in most yards without being kicked out or fined by the EPA.
Please don't compare the auto guys. I would be fired on the spot if I produced a finish similar to most modern cars. Way too much peel. People don't pay 20-30k for a finish unless they expect perfect. Most auto painters are neanderthals compared to what we do.