With the POR kit, I don't think you really need the alcohol. It can't hurt but I'm not sure you need it. Once all the repairs are done to the frame just hit the flash rust with a quick wire wheel if you want to. Wash it really good with a scrubby sponge and the Marine Clean diluted 4:1 with the hottest water you can stand(I did it twice). That's 4 parts water to 1 part Marine Clean. That stuff is the best cleaner/degreaser I have ever seen! You don't need to use it at full strength. Once it is clean, rinse it off, dry it with a towel then coat and soak with the Metal Ready. Watch where the Metal Ready drips off the frame. Have a few catch pans set up to collect what drips off and return it back to the spray bottle. You have to spray it down 3-4 times to keep it wet so you can go through it fast. It is reusable and fairly expensive so it is worth it to try and collect and reuse as much as you can, IMHO. Once it has soaked for 30~45 minutes rinse it and let it dry. It will turn a golden brown color. If there is any white chalky substance anywhere just wipe it with a clean dry towel. After that you are ready to apply the paint. The Metal Ready etches the metal and leaves a zinc-phosphate coating that I don't think you would want to wash off with the denatured alcohol.
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1979 CJ7, FI 5.0L Ford, NP435, D300, Full floated D44 Detroit, D30 Detroit EZ Locker.