Slime Bike Tube Sealant Slime Tube Sealant seeks out and instantly seals tread area punctures up to 1/8" (3mm) using Fibro-Seal technology. Install in your bicycles, dirt bikes, wheelbarrows, riding mowers and more, and enjoy two years of continuous flat tyre protection. Slime works repeatedly to repair new and existing punctures and is effective for up to 2 years.