[fatlazyless]

For $99.99 Harbor Freight has a Bauer 20v cordless 4-gal backpack sprayer without the battery which is designed for spraying chemicals.

Will this work with either latex or oil wood stain?

Stihl makes similar backpack sprayers that cost $400-$500 that are also designed for spraying chemicals.

Harbor Freight has different 110v paint sprayers for either latex or oil.

You can probably thin out oil stain with paint thinner and use it in the $99.99 Bauer but maybe not?

Sprayers can make a fast mess and can be difficult. Nothing better than a roller and paint brush for best looking results with better control on the paint application.