Thank you for posting your feedback. We're sorry to see your low star review on DAP Kwik Seal Plus. Based on your description indicating that cracking began to appear "immediately", it would appear that there may be some instability in the surfaces that were being filled and/or the product was being applied too thickly (which can result in uneven drying/tension, leading to cracking). The competitive product you are referencing (a 100% silicone) is a completely different chemistry from DAP Kwik Seal Plus (acrylic-latex/water-based formula), which dramatically different working properties/performance characteristics. The equivalent DAP 100% silicone product would be DAP Silicone MAX. Without more details about your application conditions and project specifics, it is difficult to provide a more detailed reply in this format. At your convenience, please feel free contact DAP’s Technical Customer Service Department at 888-327-8477, so that we can obtain some additional information from you to help us better address your specific concerns.