Outdoor
1. Behr semi transparent stain or Behr ultra paint is a good choice for the best protection.
2. Three coats is best but two will work well and It is available at Home Depot.
Indoor
1. Use Varathane 2-in-1 indoor Water based wood stain with at least two coats.
Finishing Details
1. Roll on stain with a small foam stain roller and then go over the stain with a foam brush.
2. Lightly sand between coats (220 grit). Do not sand the last coat.
3. Read and understand all safety recommendations.