I have an aluminum hull
boat, and its almost 50 years old. I have had it for 9 years with an isolation transformer. Never have had corrosion
issues on the hull
I had it autogauged and it came out great..
We found two corroded areas on the fuel tank
. Apparently a PO left something corrosive sit in the bilge
. Fixed with high quality epoxy
Its a Burger and the workmanship is top quality.
There is an architect named Michael Kasten and he discusses the topic in some detail.
If i ever buy another boat it will be aluminium.
Looks like the lady worrying about a few boat units for welding repair is having that "bargain price" catching up to her. I feel bad for her, but all in all, if that is the only problem she has on the hull she is getting off easy.