Q: How do I prevent the track connecting pins from sliding out?

A: Here is a quick and easy way. For plastic tracks, get a can of spray primer designed for both plastic and metal. For metal tracks, get a can of spray automotive or self etching primer for metal. I use Krylon red brown primer for plastic tracks and Krylon Rust Tough red oxide enamel primer for metal tracks. Apply a coat of primer, followed by a coat of color of your choice. The primer will adhere to the exposed side of each metal connecting pin, preventing it from working its way out. Note that paint by itself does not stick well to the smooth metal connecting pins.