A professional grade patch for permanent repair. The Great Wall Patch has a unique self-adhesive backing for super easy application. The quick 4-step process is: (1) peel backing from the Great Wall Patch, center over damaged area, and press on. (2) Spray patch with water. Rub patch to activate the plaster. (3) When patch starts to harden (3 to 5 minutes) press lightly to create an indentation. Let patch dry completely. (4) Cover with joint compound (not included) and then sand and paint. Other features include: Superior packaging with peg hole and complete instructions and images (all visible on outside of package), ultra thin construction, easy-to-use, superior strength, conforms to textured walls. Available in 3 sizes: 4" x 4", 6" x 6", and 8" x 8". All 3 sizes are available in single packs. The 4" x 4" and 6" x 6" sizes are also available in money saving 5 packs.