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Again it has been a few years sense I painted my 15 but I think I used a quart of color on the Inside. you could buy 2 quarts and see how far it goes on which ever side you paint first. If you use one or one and a half you will have a better Idea of what will be needed to finish.

I did find out recently it takes a lot more to get around my 19 than I remember using on the 15.