I had to get a new inner fender for the passenger side due to 40 years of battery acid leaks.

I had to strip the undercoating from the drivers side so I could have both inner fenders powder coated.

Then I made sure I re-applied the coating on both inner fenders after they were done. I buy the undercoating spray cans from Eastwoods. I figured the coating will protect the finish from stones and also cut down on the noise (from the debris hitting them).