We need to re-stain the exterior of our log home & have a couple of questions on what a few painters offered. One was to apply a one coat stain & then a one coat sealer. The other suggested the Sherwin Williams Woodscapes, which I like. Both were going to lightly power wash. Can I go a lighter shade with the Sherwin Williams & does it need a sealant over the two recommended coats. Thank you.