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As a kid, we mixed 80% 90wt gear oil with 20% gasoline and poured it into the doors. The gas helps the gear oil creep into all the (partly rusty) seams, and then evaporates. The gear oil attracts some dust, and forms an oily paste that will not wash out. We had the only '72 Ford wagon that wasn't rusted out, in Michigan. Yes, it stinks, but yes, it works.
I have since used straight gear oil and/or ATF, since ATF will easily spray from a trigger-style oil pump sprayer. After you do this, close the door on several sheets of newspaper to soak up the excess that runs out of the doors. Then wipe off the outer painted surface, and the lower door edge, and you're done.
Use oil. It is thinner and will run into the seams further than your gonna grease. Do not pump grease into the weepers.
Originally Posted by speakerfritz
wd-40 does not inhibit rust
Not from my experiences. I have many rust free machines in my garage thanks to keeping them coated with WD40. Machines that look like this and the get sprayed with pressure washers.
Get a small paper cup with some por 15 in it. Use blue painters' tape to tape up the drain holes. Pour in the por15 and let it fill the entire bottom inside the door. As long as you degreased the surfaces, it will stick and no water will ever get into the joint. Before you are done, pull off the tape and clean away excess. This is my basic permanent preventative maintenance standard for all classic trucks I am restoring.
Wd40 evaporates in a few days and looses its usefulness in standing water.
Even oil will evaporate over time.
Spraying the entire inside of the door with heavy duty anti rust will be a permanent pretty inexpensive and permanent fix.
I'll be removing my door panels to upgrade my speakers soon so I will do some preventative maintenance to prevent corrosion issues. One thing I will use is a product called Corrosion X. This stuff is approved for aviation and my father sprays the inside of all access panels on his plane during the annual inspection. I have no ties to this product but thought I would throw it out there since I've seen how well it protects metals on airplanes.
I removed the door panels, vacuumed out the dirt and mixed up some axle grease and used motor oil and coated the inside of the doors up half way. Every fall I check and recoat if needed. The truck is a 2004 and no rust yet. I also soak above the rear wheel wells with used motor oil. That foam strip must be oil soaked because there is no rust there either. Works good for living in Michigan.
I removed the door panels, vacuumed out the dirt and mixed up some axle grease and used motor oil and coated the inside of the doors up half way. Every fall I check and recoat if needed. The truck is a 2004 and no rust yet. I also soak above the rear wheel wells with used motor oil. That foam strip must be oil soaked because there is no rust there either. Works good for living in Michigan.
Wish I had known about that when my dad owned my truck I got it after it was too late to prevent the rust, 3 months later it was bubbling up.
I also do the rocker panels every fall with the used oil and grease. Put a rag on a straightened out coat hanger and plunger the oil and grease up in the rockers until its running out every where. Very messy job so put plastic down. It will drip oil for a week so be careful where you park. Same results, no rust.
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