Looking for some finishing advice for a 20 year old porch that has never had a finish on it. Porch is in excellent condition, on the north side of my house in Massachusetts, constructed with 2x6's, exposed to the weather and recently steam pressure washed to remove dirt, grime and mold. Should I paint or stain? If stain; clear, solid, semi solid? Best brand? Primer; yes, no? Would appreciate any advice that will produce a long, lasting finish. Thank you for your participation.