I have done 2 boats. 1st boat i did the deck and floor with 20oz and the lids with 16oz and the 2nd boat did all of it with 16oz. I did not like the way the 1st boat turned out but the 20oz carpet was nice to stand on (with bare feet). The lids were harder to open (The ones that met the deck carpet). The lids are easier to open on the 2nd boat and standing on the 16oz carpet is not really noticeable. Use DAP contact cement on the lids (be sure you have the carpet ware you wont it when you put it on the lids it will not come back off )