After using the weathered brush you should use the flap-wheel head in a grit p150 to clean up the wood and to make it ready for stain and sealer. This gets you both products.
“The flap sander came in and we knocked out nearly 500 ft. of trim in a timely manner. Purchased the 100 grit inserts and the design conforms to moulding profiles great. Truly a labor saving addition to our cabinet shop. Thanks for your product”