Joe,

I have a 98 willies and also purchased the coat-it option. I too found the coating extremely thin.......not really what I expected for the 150.00 I paid as an option.

If your coating is as thin as mine was, you will definitely want to add a couple coats. I put 2 additional quarts on the center half of the bottom as this is where most of the impacts occur. It's just cheap insurance. Was kind of a "bush-league" move from a company that, otherwise, builds a great boat.