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Rust repair Rear Fender Wheels / Door Trim

1708 Views 16 Replies 7 Participants Last post by  numbing
As some have pointed out before, and i noticed starting on mine, the trim around the rear wheel well and where the door closes traps water and i think the way the trim is designed it wears into the paint, causing rust. if this gets too bad it can eat into the weld between the inner and outer body panels, cause the whole area to rust out.

I checked my truck and sure enough that area was starting to rust, not too bad, but starting and i could tell was going to get worse. so I decided to try some preventative action. it may not have been the best most complete job, but it sure makes me feel better about it.

basically i just removed the trim and sanded down under it where there was rust to the bare metal. cleaned it up, primed and painted. it actually was much faster/ easier than i thought it was going to be. I DONT THINK that the rust started to get in between the panels, but its possible. if it is, well i dont really have the means to do anything about it at this time, so im going to keep an eye on this area and see how long my fix holds up, if i see rust coming through the paint again maybe something more intensive will need to be done. Im trying to keep this thing relatively rust free!

anyways, I def recommend just checking your truck and see if rust is developing, and decide if you want to do anything about it. luckily for me the white of my X matched pretty well with regular ole gloss white enamel, others may have a harder time finding a good match, but the area is only visible when the door is open, so you could paint the inner fender area flat black or gray or something and it wouldnt look too bad.

Before: the driver side was about the same condition and got the same treatment.
Tire Wheel Car Vehicle Automotive tire

After about 10 minutes of grinding and sanding, I did more after this pic and before painting to try to get as much rust off as i could. yes my grinder got knocked off track and dug in at one spot, .. oops.
Tire Wheel Land vehicle Vehicle Car

Taped off and primed
Tire Wheel Land vehicle Car Vehicle

first coat of white, i did a second as well
Tire Wheel Vehicle Automotive tire Light

all done! just gotta let it dry
Tire Wheel Land vehicle Vehicle Car

I ordered this replacement trim on amazon, looks like it will do the trick, I cut it to lenght matching the old ones. my thought though is, should i just leave it off? it seems to me like the trim is the reason that the rust started there, so maybe its better to leave it off? the door has its own seal anyways, and the whole back side of the door isnt even really sealed, which is how water gets in there in the first place.. i have to let the paint dry overnight so im leaving it off until then anyways.
Automotive tire Motor vehicle Wood Grille Bumper

Paints used were Rustoleum self etching primer and rustoleum gloss white enamel.
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Nicely done!!
I took mine off and they had about the same or a little less rust than yours - sanded them back and taped/painted it so the black paint looked like the rubber trim. I just left the trim completely off - there is a second seal for the door...I think it just there to keep muck out of the doors.

FYI don't forget to look at the back side - you may need to take the tire off....I found almost as much rust there.

I did attempt to sand down the inside of that lip and spray it with primer, not the best job but better than nohting!
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Well done !
I have to do this sometimes too, I have checked my before and yep there is rust.. but also I have a pretty sad rust spot on driver rear side pretty much right below gas tank lid..
so that needs to be addressed somehow..
Was thinking to paint lower part of the truck black or something but still thinking..
just some ideas.. not sure yet..
View attachment 146005

I think that eventually Im going to repaint my entire truck with some sort of bed liner type product. Im thinking either a fde or desert tan, or an OD green, yes im kind of going for that miltary look! Ill do the plastics flat black.
Here is the thread of when I did mine. There is a plug you can remove in the fender well and spray some Eastwood internal frame paint in to help.

thanks! im definitely going to pull that plug and spray some stuff up in there! I have some rust preventative spray, though its more like wd40 or oil based than paint.
idk i think i can see some rust starting to show through the paint. Im going to take a closer look this summer and try to come up with a better solution. the problem is you can only sand/ grind so much material from that area before you start eating into the seam.
I also have the part numbers for the fender well trim in that thread in case anyone wants to order new ones.
I left it off, it seems to have only collected water and accelerated the rust issue.
Was rust neutralizer or rust encapsulating primer used? Thinking of something like those POR15 kits. I think without doing that the rust would start coming back almost instantly

I used some sort of rust inhibiting primer. it has still significantly stopped the rust or at least slowed it down. but i think i just didnt get 100% of it removed last time. I'll probably end uo doing it again with something stronger/ more effective. luckily its a small area and not a hard to time largely time consuming job.
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