Duped again.
All materials have their strengths & weaknesses.
For a good compendium of articles comparing aluminum, steel and fiberglass - click here:
http://www.geocities.com/alloyed2sea...icalForum.html
For other, more specific problems with aluminum - there's always TEF-GEL:
http://www.spursmarine.com/tefgel5.htm http://www.tefgel.com.au/