You owe your paint brush the best care. And these tips will teach you how to give it. 1. Rinse new brushes well to remove sizing. To avoid damage while shipment, new brushes are often packaged with a water-soluble “glue” that holds the bristles together (even brushes shipped with a plastic cover over the bristles may have sizing in the paint brush). The bristles will feel stiff and crusty and may even get entirely glued together. If you merely break the bristles free of the size while the paint brush is still dry, a residue of sizing will remain in the paint brush, impairing its performance and causing it to…