If you installed QB tire sealant to repair an existing puncture, it may not have adequately sealed on the first attempt. We recommend checking the tire for puncturing objects, removing any if found, re-inflating the tire and immediately rotating it. This forces the sealant to flow around the inner tube or tire allowing it to locate and repair the puncture. QB tire sealant is not guaranteed to seal gashes from glass or metal, bead leaks, sidewall punctures or pinch flats. Be sure to check your valve to ensure air loss is not occurring at this source.