Thank you Steve for your reply. I wish I could give more info on my vessel, but I don't have it. What I do know however is that it is a custom french built sloop 1988 vintage and was put up for US gov't property auction in 1995. I'm sure you get the idea of why it was there.

The boat has been out of the water for four years( bought in 2004) and have finaly begun restoration. The keel appears to be weeping slightly and feel the waste water holding tank might be the culprite.( bilge water drains there also from incidental rain sources) The keel has been patched over the years and plan on taking it to bear metal to inspect closer and probe the hollow forward section for corrosive dameage and replace if necessary.
I plan on incapsulating the keel in epoxy first then second coating it in a mixure of epoxy and sand that Paul Oman has recommended for this project. Would this approach be adequate for aluminum corrosive deterioration or sould I primer beforehand?
Any other recommendations by you will be greatly appreciated.
John