Staining a new construction wood barn with an oil wood stain. I've always have used a hand pump sprayer to spray on the stain and then back brush it. I've only had to stain decks till now. However a full barn it was a larger structure and burned thru 3 pumps. The cheap ones for spraying garden variety solvents. I bought this backpack sprayer mostly because it said it was professional grade Solo Backpack Sprayer. It wasn't. Didn't want to contaminate my only Graco sprayer with oil based stain. Is there a hand pump sprayer worth it's purchase for small to medium sized jobs?