This is a good material, I'm not sure how expensive it is to make, seems a little expensive to buy. in the front half of my 10ft top kayak seat. I encountered metal and sharp rocks in the river I like to go to, that's what convinced me to buy this. I expected him to fill in more than he did, but I think it was a miscalculation on my part. I recommend the product. When it fully cures, it gets pretty strong and hard, which I like. The footprint on my kayak is nice and strong rather than pliable…