Agreed, I to only use marine mineral spirit exterior grade Poly as I just dont like doing it again once it gets wet a few times (lesson learned). having said that I have only had to use 2 or 3 coats dependent on looks. If your applying it manually this is easy to tell and feel, but if your using a sprayer and don't know how to use it properly it can come out dull now matter how many coats you apply.