Use removable adhesive hangers to hold your canvas paintings without nails. Hook hangers are available in two styles: conventional hooks for pictures with a hanging wire, or sawtooth styles for canvases with a sawtooth hanger. Picture hanging strips, which come in two parts, similar to hook-and-loop fasteners, mount the canvas flat against the wall.
Clean the wall area where you want to apply the hanger. Rub the wall gently with a paper towel moistened with rubbing alcohol and let it air dry.
Measure and mark with a pencil the location of the hanger. If you are using picture hanging strips, make a mark for each upper corner of the canvas. Use a level to make sure the marks are horizontally straight.
Peel off the liner paper that covers the adhesive and press the hook against the wall in the marked position. Press firmly and hold for 30 seconds.
If you're using picture hanging strips, snap the two halves together and remove the liner from the side that goes against the wooden frame of the canvas. Place a strip pair at each side of the frame, aligned with the top corners. Press firmly and hold for 30 seconds. Remove the liner from the wall side of the strips and place the canvas at the marked location on the wall, checking with a level to make sure it's straight. Press firmly and hold for 30 seconds. Lift the canvas from the bottom edge to peel it away from the strips on the wall.
Let the adhesive set for one hour before hanging the canvas. Place a sawtooth hanger or picture wire over the hook and position the canvas with a level so it is straight. With picture strips, place the top edge of the canvas against the top edge of the walls strips and push down on the canvas until the strips snap together.