Rocker rust suggestions?

It could be salt and grime getting in between the plastic and then vibrations causing rubbing from the grime covered plastic

 

Remove the plastic tread cap. Buy a purple roloc wheel at napa uap. It attaches to your drill. The roloc wheel isn't as aggressive as sandblasting but will dig out the rust to clean steal. Then sand the paint with 320-400 grit sandpaper. Mask off the area and spray primer. Not spray bomb primer but a good 2 stage or epoxy primer other wise you are just wasting your time. Sand the primer when dry and paint. After the paint is dry then apply 3m clear film . That will protect the area. That is what I would do in my body shop. Or I can do it and charge $250.

 

Not uncommon to get 2" or more an hour here a number of times each winter. Lake snows off Lake Erie, and Ontario. (Erie for me) Cold air over still warmer lake carries moisture in and dumps. I am in a band where i remember a time where my side of town got over 2 feet while teh other side of town, you could still see some grass. another time, about 7 feet in four days. We are among the snowiest, though this year, i think we are actually a few inches below average.

The real deal in both of our areas though is the damn salt, which they through down on wet roads all winter long. As you know, they are always white in teh winter when dry due to the salt.

I also always towel wipe the sills and around the inside of the door when i wash it, which i thing helps, in addition to teh annual fall Krown treatment. I also hand wash it in the driveway probably 4-5 times a winter when it gets to 40 degrees or more. Fill a bucket half way with warm water, the rest with hose water.

I don't think you can totally avoid that seal mount rusting over time. Just on the drivers side though with my trucks, which suggests it is from carrying the salt and salt water in when getting in and out of the truck.

White roads from salt whenever dry though all winter other than brief periods after a heavy winter rain. Tough added challenge for all of us in the north with that damn salt....

 

If this is happening because of how much snow and salt you have in your area. I would just commit to washing your door jams every week or two.

I'm a detailer and definitely would clean the jams well and apply at the very least a sealer. I use Jet Seal for my regular paint. When cared for it will easily last a year in your door jams. Just make sure you use a pH balanced soap when washing so it doesn't remove the sealer.
You can seek out a ceramic coater in your area and see how much they will charge just to do your door jams. If you get a quality product that lasts 5+ years it would be worth the money.
I would probably be going to a Line-X dealer too and see if they can line the inside of the jam with their thin bedliner product. Then you really don't have to worry too much about maint.

You can't let salt sit against your paint. If it's getting that salty and you aren't cleaning up your jams, it will just rust through again. Get some protection on the paint.

 

See the problem here is its so cold we can run our hose as it freezes and car washes cause the locks and doors to freeze. I considered bed lining but ive heard people say it can cause rust? I'd like something tough and that lasts a very long time. I dont mind cleaning up rust once or twice but every year would be too much for my liking

Edit: I dont care how the door jam looks i just dont want rust lol

 

I do the exact same stuff as you! The salt is awful and were basically helpless for it, i personally like how krown drills and shoots the oil inside rocker panels and all that, seems to work well. And yeah only my left driver side bolt is rusted, likely due to me / previous owner putting the foot back all the time coating the metal with salt lol

 

Jesus christ, do you live in the pacific ocean?

 

No Just Canada

 

Don’t get me wrong, I’m sure salt and moisture from entering the vehicle contributes to this problem. My 16 rusted here within the first year and no winter use. Almost seems to be a prep problem before paint. Problem with 2nd gen trucks that is continuing into 3rd gen.