I can...... I'll abreviate so if I miss an apparent detail let me know if I sound crazy. Note, I run no tubes with bias tires.
Step 1:
Clean the rims with a nylon brush so it does not hurt the surface, brass may work too. I then set up a trash can with a bag in it with a coulple small wood straps so wheel sits above trash cans, if tires are on you dont need the straps.
Step 2:
Have penatrating
oil, I used WD40 and soak the one side of the wheel and let sit. After about 60-75 minutes flip over and repeat. Do this twice to get pen
oil into all areas of exposed Mag.
Step 3:
Wipe with rags to a dull oiled finish. Now use a gun
oil, as it does not fling and it sticks like the hammers of hell. I used Lucas I think last but there are several brands and I am not sure brand matters. Probably like everything else made i one spot then repackaged for each product offering?
Use liberal amounts and apply with a small paint brush, wet with heavy coat and let sit to absorb into mag taking advantage of pouroisty of the metal.
Flip over and do the other side, again do this twice however I let sit overnight on this step as its the final round.
Once completed rag wipe and leave shiny, it dulls with brake dust and road dirt. I used to do this every year but it does seem that every other now works as the rims seem to be soaked.
On the green car I only have one wheel that slowly loses air, say over a couple weeks. On the gold car the rears never lose air and one front say monthly with one say bi-monthly. To note when I say lose air its like 4-6lbs not flat, over the winter they may lose all air however with monthly pass by its never an issue. Its not too hard to keep up and also keep in mind I rarley drive in the rain so the oil really does bond and stay put. If they need a touch up I do this while on the car.
The idea is fill the metal rim and then let stand. Seems to work for Lynn (gave me info) and a few other on the left coast. I know John B has a plating that can be done which is very correct and is a sacrificial coating that also needs repop over time. I think if I remember this was like the original wheels.
Hope I helped versus confused......
PS, I also use the metal valve stems which do have rubber seals. Sometime tightening helps as I know I lose air that way too. I always torque lightly as I dont want to crack wheel.
PSS for the astute these are my old spinners as now I have a more correct looking plated steel versions.