Add a few drops of dish detergent to a bucket of warm water. Scrub the awning thoroughly on both sides to remove loose dirt so the awning patch material has a clean surface to adhere to. Rinse the awning well. Allow time for the awning to dry completely.
Examine the awning closely for tears. You may just think you have one tear, but on closer inspection you might discover other weak spots on the awning’s surface.
Release tension on the awning, if possible, following the manufacturer’s directions for doing so.
Pull the tear together so the raw edges touch. Place 3-inch-wide clear tape over the top of the tear. This is just a temporary part of the patch so there may be wrinkles in the tape.
Tape a piece of 1/2-inch plywood on the top of the awning repair area. If you prefer, have an assistant hold the plywood in place. This provides a flat support surface as you make the repair on the underside of the awning.
Cut a piece of repair patch at least 2 inches longer and wider than the tear. Brush awning repair adhesive on the back of the patch as well as along both sides of the tear on the back of the awning using the applicator in the adhesive container. Let the adhesive become tacky. This takes three to four minutes.
Center the patch over the tear. Smooth it in place with your fingers. Work out any air bubbles. Allow at least eight hours of drying time before retensioning the awning.
Remove the plywood piece. Carefully remove the clear tape. Examine the repair. If necessary, attach a piece of awning repair tape to the top side of the awning.