Activity Feed › Forums › Sign Discussion › General Sign Topics › Workbench Top – What material to use???? › Reply To: Workbench Top – What material to use???? David Rogers Member February 24, 2009 at 8:26 am regarding the lifespan of polypropylene. I’ve still got the same two 8×4 sheets I bought 4 1/2 years ago. Been flipped once. If it was a lesser material they’d be trashed…still going strong and only £23 a sheet.