K frame refinishing and rebuild advice

POR-15 if you sand blast it real well to remove ny grease or grime. Just allow about a week for dry time. If you blast or chemically clean the inside you can use it there too. Tape over all the holes and poor a pint or so in it and move the K-member around to get it spread out all over then open the lowest 2 holes to drain the excess. Next choice would be something like Eastwoods 2 part Ceramic Chassis black.