To keep the paint moist, take a small sheet of aluminum foil. Curve up the sides, add paint to the center, then add a few ...

Aluminum foil can help here by virtue of its willingness to form into just about any shape on the fly. Doorknobs are probably the most common item you can protect from paint with aluminum foil.

A pin-header was affixed to the foil with conductive paint and more tape. If you’ve ever tried soldering directly to aluminum foil, you’d know why. (And if you’ve got any other good tips for ...