I used the aluminum sheeting from the hardware store. I think it was around $30.00 for 50 feet. Depending on how picky you are with your tops, you might find you don't like how they look without bending properly. Luckily I found a really nice metal break. Play around with a few pieces on bending in the corners. I ended up tucking one end in and folding the other over like a 45, but there are differnt ways to do it. I tried different glues on the top to the aluminum, but found with a nice bend on the sides it's not needed (plus the glue doesn't stick anyway). I used 3/8 stainless steel staples to attach the aluminum. I think the money spent on polyurethane glue is well worth it especially on a plain lap joint. One more tip: The aluminum cuts really well with a good piece of flat steel and sharp utility knife.