Penofin Ultra Red Label Wood Stain Review | Turns Black in Color - The Penofin Red Label applied very easily to the surface. We watched the stain absorb into the wood within a few minutes of application. We used a stain sprayer to apply then back wiped with an exterior stain pad. The final result was an even beautiful finish. One issue was the smell. Penofin has one of the worst odors of all deck stains tested.