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Aluminum engine block internal coating suggestion

I have an aluminum outboard engine block that has some minor corrosion in the internal water passageways. I'd like to treat/coat these areas as I believe they are leaking water while running. The block is fresh-water cooled. Any suggestions?

Thanks

Mike Rebollini
Marine Repair - Benicia, California
2006

Latest suggestion has been Glyptal. It's been used for years on lifter valleys inside race engines.

Mike Rebollini
- Benicia, California, USA
2006

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