We also cut down 4'x8' sheets of AluPanel, (aka Alumicore, Dibond, etc.) to make both large and small custom sized signs. It is ideal for business signs, advertisements, and long term construction sites. It is both light weight and strong. It will dent easier than our premade small signs, but the dents will not be as severe, since the sandwiched corrugated plastic acts as a cushion.
This material has now substituted wood signs for us, because we don't need to prepare them with paint, etc. the cost of getting a sign made of wood costs just as much now and takes longer to prepare.