For repairing small tears in canvas, I recommend using a canvas repair patch or adhesive. You can find patches made specifically for canvas that you can easily cut to size and apply. For a more seamless fix, try using a strong fabric adhesive like Tear Mender or Gorilla Fabric Glue. If the tear is larger or in a high-stress area, you might want to reinforce the repair with stitching after applying the adhesive. Just make sure to clean the area first before applying anything, and consider using a waterproof product to ensure long-lasting durability!