I have a bid to get out tomorrow to replace some existing carved signs we did years ago. Some will be patched, repainted & reinstalled. But there is one that is 15lb HDU mounted low on a brick wall. It has been severely abused. It's been whached with sticks, hit with rocks, scratched with knives etc. It's right on the sidewalk and also it's the school bus stop. The customer wants something more resistant to damage. I was thinking of a hardcoat on top of HDU or maybe 1" PVC instead of HDU. I realize nothing will be able to withstand all the abuse, just want something that will hold up better. Anyone have any suggestions or experience they could share with this issue?