On the other hand, steel is durable, strong, and feels less cheap. Before painting the sensors, I dabbed their lenses with reddish-pink latex mask. After the paint dried, the masks were just peeled off. I poured it over all the backs of the printed circuit boards as further electrical insulation. No need to dry beyond tacky.
Liquid latex is a weak conductor.
A splotch on paper and an ohmmeter demonstrates only 150 kilohms of resistance. Showing some signs of intelligence, I socket my DIPs. All other chips and components escaped without apparent permanent injury. The container has plenty of room for motors, batteries, and three homemade printed-circuit boards. With the exception of two pieces glued to the frame, everything disconnects either through screws or Molex connectors.