Why Not Truck Bed Coating to Refinish/Restore Inner Cowl?

I used this on the inside of my cowl.
Eastwood Internal Frame Coating 14 oz Aerosol

The problem with the bedliner is that it will be difficult to apply and to cover everything. Also, if you go with bedliner I recommend a 2k catalyzed variety. I did the trunk of my dart with it and it turned out great. Raptor is what I used. It is tintable too so you can match it.
raptor bedliner | eBay