[Evans, Marv]

Denis, from the looks of the first three pictures, it looks like there is exposed wood with old stain/sealer of some sort. If there are still areas where there is some kind of coating/sealer, obviously it will be hard to get something to penetrate well & evenly. If you can power wash the old sealer/coating off without damaging the wood, you are good to go. If not, a decent sized belt sander might be needed. I had a redwood deck that I first flipped the planks over & later on belt sanded them later on when I had to treat it again. The cheap stuff lasts for about a year. I finally found a product named Amteco TWP (the TWP is for "Total Wood Perservative"). They have different products, some of which are EPA approved oil based stains & sealers. I used one of their oil based, redwood stains on the deck, and it lasted about 3+ years (YMMV). You might do a search for them. I bought mine from a place east of I-5 across from University Town Center north of S.D. Nothing lasts forever in the sun, but this is the best stain/preservative I found. They sell a lot of it in 55 gallon drums to the government. If you can find a distributor close by, you might consider using it. There aren't many distributors around, since I suspect it's mostly a commercial product. If I remember right, it cost around $40/gal. last time I bought some about 4 years ago.