I've noticed that the factory black undercoating that's on the insides of both rear wheel wells on my Mustang are starting to wear out and disappear. I can see my car's paint color under the black undercoating on the inside of both rear wheel wells. Most of the wear is located on the inside left and inside right sides of each wheel well just to the right and to the left of the tire and on the top of the wheel well above the tire. How does the factory black undercoating wear out and disappear from the inside of both rear wheel wells? Does it wear out from the water splashing on to the inside of the wheel well while driving in the rain and snow? Is this a problem because Ford applied a very thin coating of black undercoating inside the rear wheel wells? I am afraid that the exposed painted metal inside both rear wheel wells in the areas where the black undercoating wore off will cause the inside of both rear wheel wells to start to rust. Will both rear wheel wells start to rust because the black undercoating is worn off? Is there any way to fix this problem? I was thinking of purchasing some 3M rubber undercoating spray and applying it all over the inside of each rear wheel well. I am really afraid that the exposure to the salt that the bare painted metal inside both rear wheel wells already had by winter driving might be too late to prevent rust from appearing even if the inside of the wheel wells were sprayed with undercoating right now. The inside of each rear wheel well has already been exposed to the winter road salt for the last 4 years of winter driving so if the 3M rubber undercoating is applied to the inside of each rear wheel well to cover the exposed painted metal, will the metal rust after it is undercoated because it already went thru 4 years of winter driving in road salt? I never noticed that there was any exposed painted metal inside both rear wheel wells until I happened to inspect my car up on a lift while the oil was being changed. Is there anything to worry about once undercoating is applied to the inside both rear wheel wells to the exposed painted metal? Do you think that the damage has already been done and that the inside of both rear wheel wells will start to rust because the factory undercoating wore off? Or is there nothing to worry about? Please tell me what to do to save the exposed painted metal on the inside of both rear wheel wells from rusting. Thanks
Anybody know about this that can tell me whether or not it's a common problem and whether or not undercoating inside of both rear wheel wells will eliminate any rust problems? Please respond.
No, I don't have a picture, but if you look inside your rear wheel wells, you can see whether or not the black thin undercoating that was applied at the factory is wearing off. You will see the paint color of your car in the areas where the black undercoating is wearing off. I'm really worried that rust will appear in the exposed areas inside the rear wheel wells because I already drove in the salty roads all thuout this winter without realizing that the undercoating wore off.
See the previous reply and its link. It is probably wearing off because of all the sand, salt and whatever else is hitting it. Just clean it up, rough it a little and reapply with some undercoating that you can buy at an auto parts store.
Yeah, I'm going to wash the car and pressure spray wash the inside of both rear wheel wells and then apply some 3M rubber undercoating. I just hope that rust will not appear after I apply the undercoating. What are the chances of rust appearing after I undercoat the area? I don't see any rust there at the moment, but I'm afraid that it could appear because I already drove the entire winter in the salty roads.
I can't really tell. I can see the paint color of my car inside the wheel wells where the undercoating wore off, but the paint looks really dull. I cannot see beyond that, but I can tell that the paint is really dull and dirty looking. I can't tell if there is any rust.
I took my Mustang to the body shop and they fixed the old undercoating which was bubbling and peeling that was on the inside of the one rear wheel well. There was no rust on the inside of the rear wheel wells. The body shop used 2 cans of 3M heavy duty rubber undercoating spray on the inside of both rear wheel wells....one can for each wheel well. The inside of both rear wheel wells look like brand new right now.
www.por15.com Us guys with classics use this stuff all the time. Once I replace the floor pans in my 67 I'm going to use this stuff to coat everything so I'll NEVER have to do it again.
