Wow, that's the exact opposite of my experience. I've tried Slime twice, once came from the factory with Slime, another I tried adding it. I have never seen it actually seal even the tiniest hole. It just make a huge damn mess and makes it difficult to patch the tube.

If I got another bike with Slime in the tubes, I wouldn't ride it a foot without replacing the tubes with ones without that horrible cr4p in them.