On Thu, 26 Apr 2007 19:50:21 -0400, "Buck Turgidson"
wrote:

Partially out of laziness, inertia, procrastination, and partially because I
use it several times a month, I leave my Porter Cable air compressor full.
Does this do longterm harm to the machine?



Maybe. When you drain it do you see water? Water (and oxygen) will
rust the inside of the tank.