Even a single layer works well. Easy to remove sticky cheese, in fact it washes well and I re-use it. I take a bit backpacking to strain sediment from water.
Used to be good...
I ordered this product when I first started making cheese and loved it - it never stuck to the cheese, was strong (you could even get multiple uses out of it). They must have changed vendors, because the stuff I got this summer (July 2013) was terrible! The cheese gets lodged in the ridges in the cloth and it is so fragile it tears when you are putting the curds in the mold. Please go back to your previous vendor!