At some breaks something, gets a blow, a hole, a deep notch, ... eg surfboard, paddle, ... and you want as quickly as possible using the machine again. The only condition: it must be dried and dust and grease free. In the room the replenishment preparatory, transparent tape or plastic wrap over it, lay a few minutes in the sun, film peel finish. Experience: 1. in overcast conditions, it should also work, supposedly just takes longer - for me these bodies were never really hard. In the blazing sun but without any problems. 2. the connection points as described really good roughen with sandpaper attached. 3. who are exposed to more flexible load, such as a paddle shaft, are not suitable. The Solarez material hardens hard and breaks in places that are designed flexibly.