Hi I have a 2 ft. x 4 ft. white board that I drew a 1 in. x 1 in. grid on. As of now my group plays by simply placing 2 pieces of sarran wrap over the top of it, and then drawing maps using expo markers. I was wondering if you guys had any suggestions about how I could put some permanent covering on it so that we dont have to go through the hassle of re-applying the cover every session we play. Preferably something cheap.