We used regular untreated lumber and added this Behr outdoor transparent stain to give it a little color and protection, but if your swing will be in the weather a lot, you might want to consider ...
Then sand the entire swing with 150‑grit sandpaper. The swing is now ready for any exterior wood stain, paint or finish (we used a semitransparent exterior stain). Wipe off the dust and vacuum the ...