There are several factors that go into making a good fiberglass repair. The key is locking the new material to the old. While cleanliness is paramount, that is only half of the equation. Even with the surface clean and prepped, a mechanical bond is needed to secure the actual repair. This is best done by a super clean environment followed by the appropriate depth of sand scratches applied by an expert..for only the expert can distinguish in every appropriate situation. Compressed air and allowing moisture to properly flash, this is critical to identify lose material needing removal. Finally…..The artists touch is required in the hand lay-up technique, restoring the strength,rigidity, and flexibility.