My experience of slime is that it is shoot.
I once had a small puncture on a Marin hardtail whose normal inner tubes had been "enhanced" with Slime (the bottle type which you pump into normal inner tubes).
Well, I pulled the tube out - when it went flat with a minor/small hole - and pumped it up a little, whereupon both me and my brother gazed in dismay as the hole expanded in size as the Slime seemed to be melting it and making it bigger...
Inner tube went straight in bin, never touched Slime again.
I go for "puncture resistant" tyres with kevlar reinforcement and Panaracer's "Kevlar Flat Away" strips which you have to wind around the inside of your tyre.
Both I can assure you have been far, far better than any Slime product in my experience.