The difference between solid, semi, and clear is something we go over during the presentation. I thank everyone for the links and advise. It never hurts to check on new products and advice but I'm sticking to my guns on this one. Our personal moto is quality over quantity. We get a lot of work by word of mouth. I'm not risking that over a poor product. Even so the extra cost of "all natural" over what we recommend would turn this $1800 job into twice the amount more often. He would never go for it.