i have used stopleak before on my monte carlo and it did work temperately. it only works if the leak is in the metal pipes, so if it is around rubber you will not get to much luck, and it generally only works for one season, you will have to get more stopleak and refil every summer.

because of this and from what it sounds like on this forum, that there is long term damage, i would recomend getting some dye and finding the leak yourself
i still need to do this

 

il try some of that dye soon here im pretty sure I know where the leak is. and a new condenser isn't cheap.