[1bayouboy]

Check the re-gelcoating page at this site
http://www.bertram31.com/proj/tips/index.htm

Seems like a 2.0mm or a 2.2mm can be used.....
I think Awlgrip uses a 1.8mm.....I just ordered the 1.7 and 2.0 kits for my porter cable hvlp gun