Stall and barn wall sealing

What do you recommend for an easy stain/finish/seal for barn and stall walls? Bonus points if I can use the hvlp sprayer instead of painting on. It’s going on plywood, tongue and groove pine and hemlock.

We used Minwax golden oak stain, two coats and one coat of a clear sealer.

We sprayed directly out of the can, the sprayer had a bigger hose that goes in the can.