On Sat, 12 Sep 2009 17:52:03 +0100, EASI54
wrote:


I have an aluminum hull which I have sandblasted and would like to know
the best approach to sealing the keel/hull seam for added protection
against any pin hole leaks that might exist prior to primer. I've heard
of many primers and would like to know which one works the best, zinc
chromate which will eventually be phased (inorganic I believe) or
organic or other primers like Dupont's Variprime. The methods of
barrier coating seem overwhleming! I want to do it right before I
proceed,.

My two cents in this scenario would be tar epoxy after the selected
primer then finish up fairing the area. Honestly, I am new to this
being my first boat and have time to get it right the first time.
Anyone that would like to weigh in on this that has good credentials
like Steve, is welcomed.

John

Normally some sort of etching primer is used as a first coat as
aluminum corrodes almost immediately after being cleaned. However, two
part paints frequently cannot be applied over etching primer.
I would suggest that you contact a marine paint maker for suggestions
for a paint schedule.

By the way, what makes you believe that you have "pin hole leaks"?
Usually leaks are patched or welded up before painting.

Cheers,

Bruce
(bruceinbangkokatgmaildotcom)