R-12 freon to sell, how?

floivanus said

There's no reason to use r-12 in a car, to convert you put an adapter on the lowside, evacuate, pull a vacuum, charge with r-134 (3/4 or so what you'd use with 134) add dye and you've converted it. For a concourse look, unthread the adapter and replace the old cap.

But, one of those 'if you can sell it' things

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A proper conversion involves more than what is mentioned above. You need to get the old mineral oil out of the system and replace it with a compatible R-134A oil. Also, you need to replace the receiver/dryer with a R-134A compatible type.

R-134A transfers heat less efficiently that R-12 so there are other steps you might need to take to get equivalent performance. All in all, if you have a R-12 system leaving it R-12 is the way to go, unless the R-12 option is not available as in Canada. If you have a R-12 system in your car get your 609 certification so you can buy R-12.