I am working on a home that had condensate drip down on interior of woods sill and mutins. The wood is not rotted but needs work to protect. I began by sanding to smooth surface. I was wondering what would be the best stain and or sealer or all in one product to use? The surface was stained prior but has not had any attention in many years. I am an amateur. Have painted wood, but never worked with stain or sealer. Thank you in advance for your answer.