Jeff:Try this...Rust: Soak the affected area in a 5% solution of oxalic acid dissolved in hot water. Follow this with a 2% solution of hydrochloric acid in warm water and, finally, rinse the spot well with clear water.
Try a product called Zud (Reckitt Benckiser, Inc.). A slurry of the powder is very effective at removing rust stains. I would test a small spot where it doesn't matter just to be sure it won't hurt the sail. I have used it on clothing with no adverse efects.
Zud is manufactured by:Reckitt Benckiser, Inc.1655 Valley RdWayne, NJContact their customer service dept, they can tell you where it can be purchased in your area.The active rust remover in Zud is oxalic acid.Den
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