John and Mark....thanks for the info. The knives are the real McCoy, so it sounds like I'm safe. Was going to fill with white (LaserBits Color Fill). Sound good?
Its been awhile but I think I used one of the paint stick fillers. With narrow and small letters they are quick and easy. They are solid like crayons and you just rub in to fill and wipe off. Johnson plastics has them as others likely do.