It might not have a clear coat on top(if it was a cheaper hood) and could produce much yellowing. If you want to try something on your own, try removing scratches with: Meguiar's Scratch X. Then apply Meguiar's Ultimate Polish. Hopefully it would be in much better form. Cover at the end with a sealant or a good quality wax. Dont forget to clay the car before starting with Scratch X. Adding cost of all these products, I would recommend you visiting a detailer and paying him the amount for doing all this. Wouldnt cost more than price of these products 