"Bela P. Havasreti" wrote in message
You'll want to use an orientation insensitive spray gun (I don't think
any of them will shoot/spray "up-side down", but some work better than
others). For instance, a gravity-feed gun might not work well while
laying on your back, trying to spray the belly

Take a look at the 3M PPS system... can convert a gravity gun to spray at
any angle, even up.