ClassicCat's did too...... I can't recall another that had quite as pervasive corrosion on the transom though....
Is that about right? If I marked any places where it's just down to primer or bare aluminum as corrosion, just
X those out or something.
Obviously, the blue bilge drain is to remain, as are a couple of splashwell drains and a few rivet holes I circled in green. Those that aren't needed should be good metal surrounding the holes that shouldn't need a lot of prep to deal w/.
Lets see how bad it really is 1st. If I've marked the corrosion correctly, there's a lot of additional prep work to be done unless you've already gotten back to something close to good metal at all those corrosion thru holes. On the far left and right corrosion circles, are they marked correctly?
This amount of corrosion on the transom indicates that extensive, careful, close examination is needed for both the inside and the outside of the hull and all the rivets below the chine rail (roughly the waterline) from stem to stern (front to back).
Might post a shot of the inside of the transom skin and some closer shots of the worst corrosion (both inside and outside) damage.