I use a 20 x 40 tarsp to cover a 24 foot sport fishing boat, i have been doing for 12 years. I have to buy a new tarp every 2 years no matter what. this on only last 1 year or less, the grommets ripped out the first week, the product is not heavy duty as listed. frankly i dont put that much stress on the tarp and it failed just yesterday. I went over to look at the boat and the tarp had a large tear over the deck area and was showing ware over the entire surface.