I few years ago we built a shooting bench/picnic table out of Trex and it was fine until I started getting into the precision game. Now, I can't keep my rear bag from sliding around after a shot and it moves completely off target causing me to have to set it up every time. I have tried carpets with rubber backing, a bag stabilizer from Protektor, water on the bench, rubber mats from Home Depot, stall mats - nothing works. Since the bench is on my brother in laws property, I can't just change the top, so I'm looking for ideas how to make it "sticky". It can't be permanent because they use it as a picnic table occasionally. My current setup is a Cowan front rest with the slick material on the bag and the rear is a protector with a carry handle. I have waxed the bags and put stock tape on and that really helps on the concrete benches at the range, but not on the Trex.