Shep Select Non-Sag is a one-component, moisture-curing, non-sag, polyurethane sealant. It maintains permanent flexibility with high bond strength and provides outstanding durability. Shep Select Non-Sag has very good adhesion to most construction materials. It is particularly recommended for expansion joints between precast concrete panels and seams on wooden, aluminum, and PVC joinery. Shep Select Non-Sag is highly recommended for bonding concrete and backed clay roof tiles.