If a customer wants their older cabinets painted without grain showing, a contractor can ONLY obtain 80-90% removal of grain without filling it with a grain filler.  If you want to obtain a look without grain showing, a grain filler should be used. When using grainfilleryou are offering a premium service to customers. From our discussions with contractors, we have found they have added a 30% premium to start with when applying the grain filler for their customer, and adjusted it as needed.  Customers usually prefer no grain showing so a grain filler is required to obtain that.