Berryman Tire Sealant can temporarily seal existing cracks in a tire's sidewall but it's not a permanent solution and won't prevent new cracks from appearing. Berryman Seal-R is designed to seal punctures, but it can also be used to seal cracks.  It is important to note that tire manufacturers and professionals generally recommend replacing a tire with sidewall damage rather than repairing it due to safety concerns related to the sidewall's flexing during driving. The flexing can lead to the sealant or patch failing, potentially causing a tire blowout, especially at high speeds.  While Berryman Tire Sealant may offer a temporary fix for cracks, it's essential to prioritize safety and consult with a tire professional to determine the best course of action. If the cracks are severe or if there are any signs of tire damage beyond minor cracks, replacing the tire is the safest option.