What to do next regarding my car's AC problem?

I have a 2000 Chevy Impala with 125,000 miles on it and have AC problems. Several times my mechanic has filled the reservoir with Freon but it keeps leaking. He dyed it and found no major leaks, (It has a different rebuilt compressor in it.) He talked about some AC leak product but what would be the best thing... show more I have a 2000 Chevy Impala with 125,000 miles on it and have AC problems.

Several times my mechanic has filled the reservoir with Freon but it keeps leaking.

He dyed it and found no major leaks, (It has a different rebuilt compressor in it.)

He talked about some AC leak product but what would be the best thing to do?
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