The liquid patch. Works fast and reliably. Doc Blue seals holes in tubes, tubulars or tubeless systems. Use for repair or preventing punctures. Puncture protection liquids have been around for a long time, but all existing products were unable to meet Schalbe's demanding standards. Doc Blue combines several different principles and is therefore much more effective.  Finally, now there is a simple and effective solution for puncture repair and prevention in tubeless systems and tubulars Dose: Approx. 50 ml per tire. For large volume tires (width 57mm or more) increase the dose to 75 ml. 25 ml is sufficient for racing cycle tyres. Ensures effective puncture protection for around 3 months. Punctures are sealed automatically while riding. Doc Blue is not intended to seal large holes caused by cuts or bursts.