Joe, Thank you for your interest in #7 Mastic. To answer your question, 5-12 hours dry time depending upon temperature, humidity, and application rate. Below are a couple of links with more info on the #7 Mastic. https://www.rcdmastics.com/products/7-mastic.html https://www.rcdmastics.com/images/PDFs/Product-Data-Sheets/RCD_7_Mastic-PDS-010119.pdf