SLiME Tube Sealant with Fibro-Seal technology is the safest, most effective tire sealant available.?Once installed in your tubes, SLiME seeks out and repairs punctures up to 1/8 (3mm). SLiME Tube Sealant works continuously, is non-flammable, non-toxic, and cleans up with water!. . . Prevents & Repairs Flat Tires. Seals Instantly. Non-Toxic. Guaranteed to last 2 years.