Don't forget the aluminum primer -- I think Wal used a yellow zinc chromate prime coat ahead of the finish coat.
Fred Street -- Minneapolis S/V Oceanis (1979 C&C Landfall 38) -- on the hard in Bayfield, WI :^( On Jul 10, 2012, at 7:15 PM, dwight veinot wrote: > Unless you guys have some special aluminium alloy then the minute you sand > or polish the mast or boom down to bare alloy then that's the minute that > oxidation of the surface starts, and that new oxide layer forms an > impervious protective layer against further corrosion, chemical anodizing > can change the surface colour but the protective layer so formed is not much > better than that formed on clean aluminium just left in contact with air, > and that passive layer forms very quick. So sand it and coat it, 2 part > polyurethane is really good and one part is OK too, seems that's what Wally > used and he said it's fine after all this time, pay attention and use the > proper tie coat on the clean metal if one is required by the top coat you > choose.
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