After identifying what you need to repair you can file or use sandpaper to prepare the surface a bit. After this, you press components A and B onto some cardboard or other flat surface. The ratio should be 1:1. Then you mix it, so it has an even and clear colour. After this, you are good to go. Apply it on the hole, leak, or crack and wait for it to harden. This takes up to 12 hours. Instead of calling in professionals, you can now fix your problems by yourself. Faster, easier, and cheaper.