Subject: a somewhat large, pressure-treated deck (16x32'). I usually pressure wash it annually as it gets blasted by the sun for the majority of the day. Mildew & the like doesn't seem to be an issue, but it gets quite "gray" by Fall. Over the years I've only used two products to seal it: Thompsons & CWF. Neither seem to hinder it from graying up and from what I've read, the only way to really retard this is to "stain" it and I don't want to. Thompson's is apparently not highly thought of these days but it is the least expensive of these types of treatments and since I do the drill every Spring, is it really worth incurring the additonal expense of another product? I also do not want to use anything that requires "roll or brush" applications because I have better things to do with my time. (I'd rather spray something) Right now, I am being referred to a couple products that are new to me: Behr "Weatherproofing Wood Finish" and Olympic "Clear Wood Preservative/ Water Guard Wood Clear". I'm not sure of the pricing on the Olympic stuff yet, but the Behr product is about $ 80-90 for five gallons. (I will need about 10 gal. for the job) Thompson's is alot less.
Sorry for the darn "book", but I'd be appreciative of any advice