Hello Michael
Like the guys said you can use SGM,Polyspan or SLC plastic covering.I have done a Ringmaster with SLC and I`m waiting to have it under the hot sun to see if it sags or bubbles since is the first time I use it. I have used Polyspan but if you don`t fill all the weave with 3 coats of clear you get some very obnoxious fuzzys,I think Bill Little told me to use CA on those spots and sand them.
Juan