EPDM adhesive is applied to both the underside of the membrane and to the substrate. It should be left to flash off until tacky and can be left on too long. If using a water-based EPDM adhesive – it is applied white and if goes clear, it has been left on too long. Bonding adhesives have a longer flashing time and can be left for up to a maximum of 30 minutes before mating the surfaces together.
