The corrosion may not be from electrolysis. Please remember that aluminum
(aluminium) is very reactive. It could be a reaction from chemicals in the
air from industry. Is it present on the inside as well as the outside? Most
people that own aluminum boats paint them with 2 part polyurethane and be
done with the problem. If you elect to go that way, be sure to use an
etching primer first.
Steve

wrote in message
ups.com...
Mabe someone can help me I have an aluminum boat it is 7 years old
only have 100 hours on it. about 1 1/2 years ago it started to
develope small pits in it. i talked to everyone including manufacturer
they said it was salt on the roads all kinds of lame stuff. i had it
buffed out and now it is getting worse its never in the water more
than hours. i have not changed anything since new.no one knows why can
you help had elec checked and is ok.