I don't know 
Never done that myself. I would think a light sanding on the backer board to clean it up and give it some teeth to adhere to.
Anyone else know, especially for the back of the vinyl?
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1982 CHP Mustang Coupe, Unit # E870567 **SOLD to chp1982**
1988 Mustang 5.0 LX, Unit # HP 43 (Wyoming Highway Patrol)
1991 Ford Crown Victoria S (Brentwood, CA Police Dept/Cinema Vehicle Svcs)
1992 Chevrolet Camaro RS B4C, Unit # 360 (Colorado State Patrol) **SOLD BACK TO CSP**
1996 Bronco XL 5.8L (California Highway Patrol)
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