ok so this was a question that i posed the other day & now that i have the answer & have completed this process, i want to share it with you all.
first thing you are gonna want to do is go to Home Depot or Lowes & pick up a tube of Seal All and a tube of Goop. then you will want to clean the inside of the wheel especially around the spokes very thoroughly. that way the seal all will get a good seal to the metal.
now this is the hard part.... no actually its not, just time consuming...
set your wheel down something that way you can spin it as you are sealing each individual spoke with the seal all. i started on the first set of 4 spokes right after the hole for the valve stem. now just put a small amount of sealer over each spoke, making sure it is completely covered.
i went around the wheel twice covering each one with 2 coats. take your time allowing to the sealer to get tacky that way it doesnt run on you as you are spinning the wheel.
after 2 coats of the Seal All, i went over each one with the Goop. so now you have 3 coats of sealers on your spokes. this will allow for an air tight seal & now your rim has been turned into a tubeless wheel.
pretty simple stuff here guys, its not rocket science or quantum physics....