Comment from Lubomir Jancovic, (10/11/2011, 9:44 AM)
Use blast abrasive B13 for inside and thermally spraying 20 mils of pure Zinc or pure Aluminum will protect surface of steel for 50 or more years with no other maintenance. However, if surface is painted 8 hours after blasting, then you will see rust through after 6 months.
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