30 - 120 minutes.
Removing the damaged pieces will give you the best possible repair, but with enough masking tape and paper you can repair most pieces without removal.
Don't stop until the rubberized surface is completely removed. Clean when done.
Apply multiple light coats and wait 20 minutes.
Wait 20 min. for primer to dry. Keeping your sandpaper wet, sand with light pressure until primer is even and smooth .
Apply multiple light coats. A heat gun helps to accelerate drying times between coats