That's not clearcoat failing from the sun - that's clearcoat failing from poor adhesion / bad surface prep in all likelyhood. It's obviously a repaint - not the original factory paint. This raises the question of whether the entire car has been repainted, or just the hood. Hood repaints seem to be extremely common on 10 to 15 year old cars - more often than not. That's a significant question to the cost of repainting the whole car - if the clearcoat is suspect it would all have to come off. The cost of a repaint is one of those pick-a-number exercises - it is whatever you want it to be - $500....$10,000. You are not likely to be happy with anything under $2500 to $3,000 - but that assumes no major substrate issues.