Which car are you looking to put it in? Do you care if you ruin what's left of your A/C? If you don't, go for it. If you do, fix the leak and either keep the R12, or go for a CORRECT conversion. You might want to call an A/C shop and see what they would say AFTER you try the product...

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Bill Streep
San Antonio
'57 190SL (toy)
'08 S5500 (mine)
'09 CLK550 (wife's)
'06 SLK350 (daughter's)
'11 GLK350 (daughter's)
'03 CLK310 (spare)