From Jim Katen: I'm very familiar with CPES having personally used gallons of it in the past. I don't know who the Rot Doctor is, though. I used to get mine from Steve Smith, the man who invented it in the early '70s. I met him once and he took me on a tour of his research/manufacturing facility. The man is a tad strange, but he's a chemistry genius. Again: I don't know where he is now, but he used to be in Richmond, CA near where I used to live. I was looking for a way to repair my redwood gutters at the time. Everyone I talked to told me to go visit Steve Smith. He had a big warehouse on Channel Ave where he, literally, stirred up his concoctions in big vats. He showed me around and explained his inventions with the enthusiasm of a small child. He had CPES, an epoxy filler material, several varnish replacements, several urethanes and a really cool rubber compound. He was like the Willy Wonka of the coatings world. Hi, there! I'm Steve Smith, still alive-and-well at Smith & Company in Richmond Ca. I package CPES for the Rot Doctor under license, as well as sell it factory-direct (just to clarify). You can find my CPES and Clear Penetrating Epoxy Sealer (both ©) on the Internet; this is not an advertisement. Rather, the above thread was brought to my attention by my new UK distributor; I did not know this forum existed, and I'd like to clarify and fill in some pieces. I admire everything said about me and about what folks are doing with the technology of wood restoration. I admit to being a tad strange, although I always thought of myself as more than a tad so. The the Willy Wonka of the coatings world, yes, I suppose so; I accept. Drop by if you are in the Factory neighborhood; directions are on the website. Best regards Steve Smith ps Now that I have joined, if anyone has a technical question about the technology of wood restoration (which I modestly lay claim to inventing in 1972 and establishing the Science thereof circa 1985) questions may be asked and I will do my best to answer them. To repeat, I am not here to advertise; I am here to offer technical support in this field.