Hey Rocky . . .
My two work benches are both hand made and built right onto the walls of my garage. The tops are made from 2x6 lumber set side by side for a sturdy surface. On top of that I have placed a cut to size sheet of 1/2" particle board which is fastened tight with wood screws.
When the particle board surface got all geasy, digned and gouged I just pulled the screws and turned it over. When both sides are shot I'll replace it with a new sheet.
regards,
stock49