Linseed oil is extremely flammable until it dries completely, I would be very leery of spraying it on the underside of my a coach. I suggest you contact the mfg of the brand you are thinking of using and see what they have too say, possibly contact Newell about a solution to the rust and salt air.
John
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John and Patti
Julie and Gracie (Our papillons)
91 Newell
#255
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