Pat Barber wrote:


I assume they are all "very" similar in
operation and costs.

I think all of them use the same Ametek Lamb turbine.

I learned some basic things from this book, like spraying into my own
overspray:
http://www.amazon.com/Spray-Finishing-Other-Techniques-Woodworking/dp/1561588296/ref=pd_bxgy_b_img_b

My ML Campbell dealer gave me a printed copy of this:
http://www.mlcampbell.com/secured/woodfinishprobs.pdf

Jewitt has some tips in his general finishing books. Roger Phelps has
some video on the Phelps site. I've learned lots from Robert
(nailshooter) and Mike Marlow, right on this forum.

The most difficult part for me was recognizing the different problems.
After that, the Campbell document is a great resource to have handy.

Even with spraying, some finishes need a light rub out. There are some
differences in technique, depending on the product in use. For
instance, some finishes need defects to dry before repair, but you can
often wipe drips away with lacquer on the spot. Some finishes like a
"tack coat", others like full, wet coats. When in doubt, _let the
finish dry_, then troubleshoot.