Wharever you do you need to protect the metal. Mask off the are wrong it. Sand it with 80 grit to give the metal a gripping surface. No need to do it hard, a light fast sanding is fine. Clean it with acetone or another metal cleaner. Spray a thin layer of etching primer on it, then spray it with sand able primer. Be sure to follow directions and flash times. Be sure to clean the metal well and dont touch it with your finger once its clean. Total time to do this is maybe 20 mins.
You can't lose if you put God first!
1989 LX, 306 with TF top end kit, Anderson N-21 cam, TKO 600 trans with steel splatter shield,full Maximum Motorsports Mustang maximum Grip box, Detroit locker rear end with 31 spline Moser axles. Staggered wheels with Nitto 555 315/35/17 out back.