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Not knowing the exact material that the hose is made of, I would refrain from coating them with anything. It would be a shame to have to use it in the future only to find it degraded from an incompatible spray that was put on to preserve it.
That question might ge better answered by someone from...
Just an FYI,
It is best to store belts and hoses in a closed environment like ziplock bag. Doing so will help keep them from becoming hard from exposure to fumes in the air. They should also be kept out of direct sunlight.