303 protectant. There have been a few research tests done and 303 usually comes out as the best solution. It will probably take the better part of a gallon. If you have a paint sprayer it may take less, if you are using a Hudson garden type sprayer it will take most of the gallon. I did mine last year and it needs to be done again. I would have probably gotten another season if I would have done two light coats (as recomended) instead of one heavy coat. It was difficult to get the Hudson to spray a nice even fine mist, I'll break out my spray gun next time.
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