I live in St. Louis and last summer I put thompsons deck sealer/stain on my deck and this year it already looks horrible. My question's are what is a good stain/sealer, do I now have to try to strip the old stain/sealer before reapplying another brand. I cleaned the deck with bleach but I still am lost as to what brand to try again. There seems to be so many different kinds thompsons, olympic, behr, etc. Any help would be greatly appreciated.