[Risdo]

I have a 2017 S550 GT with about 50,000 miles on it.
Bought it new, always garaged, and it's a southern car. (North Carolina)

Just noticed this. It also seems to be just beginning on the other side as well.
Anybody have any ideas? Thanks!

 

[Jeremy Weigel]

The S197's had an issue with improper paint prep for the aluminum hoods. The paint would bubble up as corrosion set in under the paint. There was a TSB for it as I recall. Could be what is happening to your hood.

 

[Risdo]

The S197's had an issue with improper paint prep for the aluminum hoods. The paint would bubble up as corrosion set in under the paint. There was a TSB for it as I recall. Could be what is happening to your hood.

I figured. As a 66-year-old, I grew up with cars that rusted right out from under you! Didn't expect this from a car built in the 2000's.

 

[kenv]

The hood is aluminum & Ford has had these paint problems since they first started installing them in Mustangs. Oddly enough, from 2015 onward, the whole body on the F-150 has been aluminum and AFAIK has not had as much problems.

 

[AndyEckel]

I might suggest taking that to a small, local, independently owned body shop and inquire about a NON-INSURANCE repair.

I would suggest you could have the entire front lip of your hood wet sanded (spot touched up if needed) and re-cleared for a song.

Hood does not need to be removed. No sheet metal repair needed. No filler material needed. Very basic tape & drape job.

Good luck!

 

[ONEZ ST]

So much for Ford managing the corrosion problem on newer model cars and trucks. But every manufacturer is having their moments with this problem.

The parimeter of the hood is crimped and is most prone to it and it can not be un-crimped, treated and re-crimped. I have also seen it on the top of the hood. Ford Warts.

You can spot-repair the damage but it will pop up somewhere else. The only permanent fix is a $carbon fiber hood if you plan on keeping the car a few more years..

 

[JBert]

What does the underside of the hood look like?

On the S197 cars this would usually start along the welded seams on the underside, then spread from there. As I understand it the problem is iron contamination in the welds, which cause galvanic corrosion that spreads from there. I don't understand why they apparently have not been able to fix this.

There was a company that was selling carbon fiber hoods for the S197's for around $1,000 which isn't too bad if you like the carbon black finish and don't need to paint it.

 

[Howelldaddy]

So much for Ford managing the corrosion problem on newer model cars and trucks. But every manufacturer is having their moments with this problem.

The parimeter of the hood is crimped and is most prone to it and it can not be un-crimped, treated and re-crimped. I have also seen it on the top of the hood. Ford Warts.

You can spot-repair the damage but it will pop up somewhere else. The only permanent fix is a $carbon fiber hood if you plan on keeping the car a few more years..

I had the problem with the paint bubbling on the hood of a 2006 Mustang when it was only 4 years old. Everyone was saying that as fast as you fixed it, it would reappear.
My solution was to get a carbon fiber hood. PROBLEM SOLVED.

 

[Ballplayer]

The S197's had an issue with improper paint prep for the aluminum hoods. The paint would bubble up as corrosion set in under the paint. There was a TSB for it as I recall. Could be what is happening to your hood.

Improper painting with out the correct primer is common. Will,bubble everytime. Looks like portions on plastic and thats is common with the primer not used or incorrct. Found that out on my Honda actually and then showed up on pony. Can be fixed easily with correct body shop or painter.

 

[JBert]

Improper painting with out the correct primer is common. Will,bubble everytime. Looks like portions on plastic and thats is common with the primer not used or incorrct. Found that out on my Honda actually and then showed up on pony. Can be fixed easily with correct body shop or painter.

welcome to the forum

that is probably not the issue here -- if it is the same problem they have had for years, it is due to galvanic corrosion in the aluminum, said to be caused by iron contamination in the welds; no amount of surface prep or priming can stop it, because it is coming from inside