All areas to be coated must be thoroughly dry and free of dew or frost. Consideration should be given to separate engineering evaluation of structural loading and support requirements. GacoFlex NF-621 neoprene sheet flashing and related materials as required for flashing drains, base angles, etc. Surfaces should be free of contaminants. Allow primer to dry completely before application of flashing adhesive or membrane.
Dry time is two to three hours minimum.
Allow to dry. Concrete surfaces do not require a primer to obtain adhesion. Dust or powdery concrete may also cause pinholes and the sealer coat is recommended. A phenomenon known as concrete outgassing may occur which causes blisters and pinholes in the applied coating. The use of the primer-sealer system is the best method known for prevention of blisters and pinholes.