Why it rusts
Temperature swings in an unheated garage condense moisture on a large cold mass of metal. It is not neglect; it is physics, and it happens overnight in spring and autumn.
The routine
Clean with a grey abrasive pad and a light solvent. Wipe dry. Apply a paste wax without silicone, let it haze, buff it off. The surface then sheds moisture and, usefully, timber slides across it with less effort.
Never silicone
Silicone transfers to the timber and shows up as fisheyes in a finish, weeks later, on a surface you cannot then repair without stripping it.
Cover it
A cotton sheet — not plastic, which traps condensation against the metal.
What comes up most often
Can I use WD-40?
To clean, yes. As a long-term protectant, no — it evaporates and leaves little behind. Use a paste wax or a dedicated machine wax after cleaning.
Last reviewed 2026-08-12
