posted on
August 23, 2009 at 11:12PM
Rust spots? That's odd. The metal tends to be Aluminium, which doesn't... rust.
Could be the steel fasteners though.
Try gently brushing away the rust with a brass bristle brush and put down a dab of 3-in-1 or WD-40 on the offending source of rust.
Or, once the rust is removed, you could "seal" the area with clear acylic paint.
Or, you could replace an offending fastener with a Stainless-steel fastener of like size, from your local hardware store.