I too like the black weed barrier cloth it does a great job and will even let water through the fabric but it only lets water through from one side not both I think the shinier side goes down and water will go through it but if its up the water will not drain through it or vice versa I cant remember off hand. I use wax paper and the weed barrier both and like both. wax paper is super cheap and I just cut the roll into 3 rolls it lasts a long time. I think one roll of weed barrier would last a lifetime if only used for pan covers and the stuff is cheap as well.
are you looking for steel screen to increase the pan surface?
Yes I got to talk to Mark Z at nta. He said try the steel ones with grass. I am going to give it a shot. I hate remaking after every rain. Wont hurt to try it.