Thank you for posting your feedback, we're sorry to see your low star review on DAP DYNAFLEX ULTRA. DYNAFLEX ULTRA is a water-based/acrylic-latex formula, accordingly, the sole drying mechanism is the evaporation of water. Dry time can be significantly impacted by cool or humid application conditions or by thick (deep) applications of the sealant. As is the case with all water-based products, they must be applied within temperature range, to dry surfaces and should be applied when humidity is low to moderate. As indicated on the product package label and supporting product literature: “Do not apply when freezing temperatures are forecasted within 24 hours. Cooler temperatures and higher humidity will slow down dry time.” Application outside of these conditions will lead to long dry times and slow performance development. Because you did not provide any details regarding your application, such as application surfaces/conditions, bead size, temperature, humidity, or your application technique, it is difficult to provide you with a more detailed reply or any specific product usage guidance in this format. Should wish to provide these details, so that we can offer you more specific product usage guidance or to recommend a more appropriate product, please feel free to contact DAP’s Technical Customer Service Department at 888-327-8477.