I have come to this flamefest to only offer a bit of my opinion. As one who has suffered the wrath of a POPPED front air bag, I would be afraid to put slime into my bags not because of contamination issues but rather potential of the bag bursting.
I now look at the slowly leaking bags as a warning that your bag is dry rotting. Yes, we know that dry rot leaks can be stopped by slime, that is a given, but what the slime does NOT do is remove or stop the dry rot. The dry rot is still there and probably still getting worse with time. Just because the bag doesn't leak doesn't mean that the dry rot is getting worse.
What happens when the dry rot gets bad enough? You have a catastrophic failure, i.e. a bag bursting. When the bag bursts, the front end doesn't nicely and slowly sag to the ground, it crashes down with a bang! that is what happened to mine.
I was lucky that I was sitting in a parking lot when that happened.
With that said, I would not slime a bag just because I feel that the leaky bad is a warning to get it replace before it pops. Putting slime into the bag is just like resetting an oil change warning without changing the oil. You keep it up and something bad is going to happen.
