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Joe,
I'm not sure of the effect (gel mentioned earlier), but I do know no US technician would touch a car that has both kinds of refrigerant in the system. It contaminates their equipment. The is a definite process to the change - wish I could tell you more but I can't. I just know when I brought my 92 in for service they guy first checked for mixed gases and said he would do nothing if he detected them.
On to the low gas issue. If you still have R12, then with low pressure you should see a white bubbly/frothy mixture going by in the sight glass located on top of the receiver/drier - whenever the compressor is running of course.
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