Delta Tire Sealant is formulated and tested for use in all inner tubes. BEFORE a puncture occurs, once the tire or tube is valved, when the wheel spins, the Sealant is evenly distributed inside the tire or tube and is ready to seal the punctures. As the Cylion Sealant-treated tube rotates, the centrifugal force pushes the sealant to the tread area and creates a layer of protection, repairing holes as they form and treating existing punctures, and for tubeless tires this Sealant is recommended for tubeless tires. . When a puncture occurs, escaping air pressure forces the Cylion Sealant into the bore immediately, creating a strong, airtight seal that closes as many holes as possible. OUR GUARANTEE We are confident that we offer some of the best products on the market. Therefore, we provide a 30-day guarantee. We will make every effort to ensure that you are completely satisfied with your purchase. Online shopping can seem daunting. We want you to know that there is absolutely zero risk of purchasing something. We won't make it difficult if you don't love it. We offer email and ticket support 24 hours a day, 7 days a week. If you require assistance, please contact us. Please contact customer service if you have any problems with your purchase.