I used 3m undercoating professional series stuff works great
I have 3 coats on the rockers stuff does not come off

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1993 Ford Ranger
3.0 V6 Automatic
Limited Slip with 4:10's
Thrush Dual Exhaust
3" PA Body Lift
2" Suspension Lift
Cragar blackout rims
32/11.5/15 MasterCraft MT's