When you seal your blade it prevents splinters from coming off of your blade when you change the rubber, and it makes it easier to change the rubber. It is protection. When you get a new blade it looks all nice and clean right? If you don't seal it, it won't look like that in the future. It is highly recommended. I was lazy and didn't seal my new butterfly blade, I changed the rubber and a three inch long chunk of wood came off of it, I was so angry at myself, take my advice and seal your blade.
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