targaboat: I also have a small area peeling. It is right above the heater-a/c vent front center (on the corner). I assume it's from the heat or cold as it's only in that one spot. I too would be interested in a fix such as a spray to re-coat the small area.
A dash cover wouldn't solve the problem and probably wouldn't do much to cover the affected area.
Vectra 40 AD (2004) and towing
PT Cruiser, GMC ZR5 4x4 Quad Cab
I have the same issue, in the same spot. It appears that the dash is covered with a very thin layer of soft silicone - like tub sealer. That is peeling off, evidently as a result of simple wear. Mine has been replaced once - after the dealer messed it up with tire dressing. Now it is peeling again.