I have my concerns about the protective films because of my AW car and some people claiming that they have yellowing... Of course others don't seem to have a yellowing problem at all (yet) and some say that if you "take care of the car and film" then you won't have any yellowing at all.
Still a concern for me... Plus, the price tag, I need another paycheck to come in right now, haha...
Anyway, I wouldn't do it at all on the hood unless you can get the FULL hood done ,a line 1/3rd of the way up will just look stupid. I suppose that if you do happen to experience yellowing down the road, you can get it removed.
'11 BMW E92 ///M3 - ZCP and DCT
'15 Ford F-250 - Lariat, 6.7 Powerstroke Turbo-diesel