Veggie190,
I don't use that kit, but I do use their 2 part rust converter covered with underbody enamel to treat and cover rust spots before oiling.
Please don't use the rubberized undercoating. As soon as it fails (which it will) it will provide more hiding spaces for salt and sand wherever it cracks and peels. Oil undercoating is the best, especially if done every fall. Even better is to heat the oil and melt a tube of grease into it. Think of how the military stores weapons for long term. I have seen 50 YO rifles unpacked and degreased with nary a spot of rust on them and ready to fire.
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