i use ABS plastic and it works great! it isnt too expensive and my friends and i have only caught our edges in it 3 times over the past 3 years. of course it helps if u dull your edges a little. i bought enough for and 8ft long boxy by 8inches wide 3 years ago. i just bought another set a week ago for 53 dollars. heres the site
http://www.indplastic.com/index.cfm?fuseac...amp;product=173
oh and something i forgot you dont need cooping with this plastic. at least i dont have it and it works great. the plastic slides super nice ill post a video soon