Thanks, Peter. Yeah I was concerned about those issues as well. As it turned out, I really had no problems at all in that regard. I was careful to not overfill the cup and I wiped the cap after every session to keep the vent hole clear. Honestly, I'm sure that my spray pattern was not always perpendicular... so that probably helped. There were no problems with feed at all. Another thing that helped was that the guitar is not held perfectly flat. There is enough slop in the brackets that it leans just a bit.