Buddy, Here is what I used to cover the "holes" in my alloy wheels. It is considered heavy duty and is used to "wrap" cars. Got on line at:
Sign Warehouse Inc.
Part number VEG-500-2410-502
24" X 30 foot long roll
$18.59 plus $10.18 shipping
This is much thicker than what I could find at local sign shops.
Hope this helps