I bought some 20rdrs that were in great condition w/ aluminum followers, but just needed some refinishing. Sorry for the pic clarity--done at night in my garage.
I went to Grainger supply and picked up a can of Loctite brand dry film moly spray.
Here I am getting started:
I first disassembled them all and cleaned them w/ laquer thinner (just a little). Some of them had adhesive residue on them. Thinner seems to work the quickest for adhesive goo and sap--for that matter (on your car).
Next, I took all the bodies up to the kitchen sink and soaked them in hot water and cleaned them w/ a bottle brush inside and out. After most of the moisture was off of them I put them on a cookie sheet w/ paper towels and baked them @ ~250* for about 12-15mins.
To get them clean and oil free before spraying I used a dupont product called Final Kleen. This is what we use at my job to clean and degrease automotive parts before painting. The paper towel used to clean them is seen in the pic on down.
Hang 'em up:
To spray them I used my heat gun to pre-heat and to expedite the drying process.
After I sprayed the bodies--outside and interior at both ends, I cleaned the followers and gave them a twice over:
Pic of complete body:
Before reassembly, I baked the bodies, springs and followers on a foil covered cookie sheet @500* for 30mins per instructions on can--lots of smoke.
Before:
After:
This arrangement shows the finish of 4 different mags: (left-right) 30rd refinish w/ CRC Moly Spray, 20rdr refinish w/ Loctite Moly Spray, 30rd D&H from EE, 20rd same, 30rd D&H Tapco $10 special