The only problem with my 18 year old Bottecchia is its tendency to rust here in my humid, ocean-side environment. Here is the worst example of a rust spot on the frame:



I've since steel wooled and touched up this spot. It doesn't take much sanding at all to get to clear metal, so the rust does seem to be limited to the surface.

So what are the best strategies for avoiding these kind of rust spots? My current strategy is to clean the frame after every ride and wax it periodically.

WD-40 was initially developed to prevent rust (WD = Water Displacement). Would it be weird to wipe down my frame with WD-40 after a ride?

(Here's a picture of the full frame.)

Thanks,