Jared, I end up painting a lot of my tubes black. I've got a square of plywood that's about 18" square, and I've driven 2" screws about 1/2" into the plywood, leaving 1 1/2" exposed. I laid these out in a grid pattern so they were about 2" apart. slip the tubes over the buglehead screws and hit them with rust-o-leum flat black, then out in the texas sun to cure. let them dry a day or two, and the CA does not cause the paint to liquify. Don't know if that's because it's rust-o-leum, or the additional time curing, but since I paint about 30 tubes at a time I generally have extras on hand and don't have to wait when I'm doing a glue up. Tubes are cheap, I normally have a few dozen extra (or more) for the most common pen styles I do.