Obvioulsy what you do and where you live gives you a much better opportunity to know and test. In addition to what you mention about Naptha, I'm personally highly sensitive to it and working with it is a challenge. But what system do you know that goes INTO the wood and seals any better than the silica in the varnish? I know this method is not a "finish", it's a sealer that goes into the the pores of the wood as far as the pores sill allow penetration of the silica because of size. Finish with anything that turns you one, but what about sealing? If you put a waterproof finish on top the wood in addition to the sealing wouldn't that be better?
