Removed the leg cowl today and did find a couple signicant 'rubs' on the leg which were through to bare aluminium. As ours receives 'kidglove' treatment (lots of freshwater after use and lives indoors), the 'rubs' were not corroding.
However, we prepped the exposed areas, etch primed and over-painted them. We then dremelled a mill or so of GRP off of the return on the cowl. This area is completely hidden and will hopefully prevent contact between the GRP and the painted ally leg.
I'm not sure how these areas would've looked if the boat had lived on a swinging mooring for the last 12 months.
Sorry for spouting forth on matters Etec, not having 'Font' status myself.