When you have broken a guide on your rod, you will need to replace it with a new one from your local BCF store. Then it will need to be under-and-over bound with rod-binding thread. Before you apply a finish coat you will need to fill the thread. This is where you will need Wilson Rod Filler. Applying the rod filler will give the thread a much stronger and tighter feel. This part of the process is a necessity as it protects the life of your bind as well as making the finished process look the goods. If you dont want your mates laughing at your rod repair and building efforts, this is a product you must have.