Obtaining an EPA license when you don't understand air conditioning technology and then using it to obtain refrigerant which is supposed to be used only by a licensed technician is a fraud. It is defrauding the licensed technician or the shop they work for.

As I said yesterday at 2:03PM

"If you plan to keep the car, I would suggest having it professionally converted to R-134. You probably won't notice the slight loss of efficiency in your climate (Boston)."

Perhaps you could come up with something original?

Now, it's time to move on to something more productive.