The China flap disc is very flexible in the wood sanding. It is capable to sand any surface of the wood whether it can be large surfaces or small pieces or sharp edges. Generally, the flap wheel performs outstanding in these applications.
China grinding disc can be used to remove all the small and fine fibers which are unnecessarily present on the surface of the wood. These rising fibers pop up and cause raggedness in the primer and soon the material will become dull and tear. In regard of this trouble, the material needs a special type of sanding in advance, and it has to be done between the coats to get a smooth top coat.
Using China flap disc is benefit to get uniform pores on the surface which gives you uniform color on the material. Furthermore, this is also helpful to make the sharp edges of the surface soft and smooth, as well as reducing the areas where hard to seal and stain. Getting rid of the tough area of the material can make the priming or sealing work easier, and less time is needed to complete the finish.