Inexpensive Disposable Brushes
Just as our "Best Brushes Available" (link) stand out for critical woodworking top-coat finishing, these round out your equipment at the other end. Made in China intentionally to be inexpensive and therefore disposable, these have extra-long 8" wood handles and natural hog bristles, but cost so little ($1.08 or $1.66, depending on the size) that you can afford to throw them away once the job is finished. Of course you can clean them up (as with any brush) and reuse them, but you don't have to. Just chuck them with a clear conscience if that seems the sensible thing to do. They come in packs of 12. Get a dozen of each and reduce the cost to $1 each for 24 brushes.