What Are Flap Discs Used For?
First, let's talk about what flap discs are. Flap discs are abrasive cloth flaps that are layered thickly. When using a flap disc, the goal is to shape or form different surfaces (metal, wood, etc.) -- while also resulting in a nice finished look. Flap discs can be used on surfaces that are uneven, making it easier than if you were to use a grinding wheel or fiber disc.
Benefits of using Flap Discs
The benefits of using flap discs are ; more safety due to pieces not flying off, different pressures to get a smoother finish, less vibration so it can be easier to use/more comfortable, less likely to leave heat marks, and a better finish.
After using a grinding wheel, to smooth out bumps, flap discs can last up to twenty five times longer than a resin fiber disc.
When you are looking for what type of flap disc to purchase, consider the job you want to get done. A disc with a regular standard density would be more efficient for stock removal, whereas a more dense disc may last longer. A good abrasive will give you a longer life when using a flap disc while also being able to grind and give a finish to the surface -- which means you do not have to alternate between different discs.