1.Using a flap disc, you will have a more thorough and uniform scuff of the sealer or primer coat. This scuffing will ensure a superior bond between seal or primer coat and the top coat.
2.If the material was properly sanded in the raw, you should now be able to use a chuck flap disc sanding the sealer or primer coat without burning through or white lining your product.
3.Using a flap disc can make sure a more uniform and overall higher quality of the finish.
4.Using a flap disc can greatly increase quality while decreasing labor.