Thank you for posting your review about DAP Weldwood Nonflammable Contact Cement. As indicated on the product package directions for use as well as supporting product literature: Allow both surfaces to dry 30-40 minutes (dependent on temperature and humidity). Dry Contact Cement will feel tacky and appear glossy. If surfaces are not assembled within 2-3 hours, applying an additional coat of Nonflammable Contact Cement can reactivate adhesive. Thicker applications of the adhesive, lower temperatures and/or higher humidity will significantly increase the required dry time prior to bonding.