If you want a finish like the professionals use, then you need to go with a catalyzed finish like Thunderbird or Fullerplast. The drawbacks are these finishes are expensive to purchase, produce toxic fumes, require spray equipment to properly apply and are a bear to repair. If you are making a lot of bows, then it makes sense to go this route otherwise stick to a finish you can apply by hand like Tru-oil, shellac, or poly. I've never tried the Massy finish so I can't comment on that, but if you go that way wear a ventilator mask and gloves while preparing and applying.