Field applied treatments are available to treat cut ends. The American Wood Protection Association (AWPA) states:

“…Drilled holes and cut ends need to be treated with a preservative, such as copper naphthenate or oxine copper (mostly for exterior use) or a boron-based preservative (for interior uses only).  Copper naphthenate specified in AWPA Standard M4 for field treatment contains 2% copper and is sometimes available in paint, hardware, or building supply stores…”