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I use a couple of coats of Zpoxy to pore fill and U-Beaut for French polishing without problems. I can't speak to having a full layer of Zpoxy - only what's left in the pores.

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http://coneryguitars.com

Kill your television!

Definitely NOT using it over epoxy of any sort.

Not that it wouldn't work, but never tried it. When I do a shellac finish I like to call it French polished, which, to me, doesn't have any connotations of an epoxy fill. So most of the tops I do are FP'd (and don't need a fill) whilst most of the backs, sides and necks are nitro over an epoxy fill.

Rather than containing "polymers", according to my sources, the U-beaut shellac has a hardener in it that promotes cross linking, a plasticiser so that the hard film becomes tough rather than brittle and a small amount of "retarder" (just a slightly slower evaporating alcohol) to make it more sprayable and easier to apply for those covering large areas, because it was initially formulated for furniture finishing, rather than guitar finishing.

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Trevor Gore, Luthier. Australian hand made acoustic guitars, classical guitars; custom guitar design and build; guitar design instruction.

http://www.goreguitars.com.au

I know someone who does, but he's not a member here. Steven Walter, http://stevenwalterguitars.com, uses it over epoxy pore fill. We were talking about it a couple of weekends ago up in Boone at a Guitar Festival at App State U. Says he has to really ventilate his shop while using it because the fumes give him a headache, but he likes the results. He sprays the first few coats before he starts the polishing process. I think he said he thins it by about 50% for spraying. He makes great guitars. He has 150+ of them out there, and you see them at the classical guitar competitions. Steven is both a builder and a high level player. He was a finalist at the GFA competition back when he was at competition age. He's now a professor at Furman University, and builds in the Summer when he doesn't have classes. He's a batch builder. Uses a bolt on neck, but builds Humphrey style with raised fingerboard, mostly. NIce guy.

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Waddy

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I used U-Beaut over zpoxy using a French polish technique on a classical guitar. It has been two years and the finish still looks great. I diluted 50% with alcohol for the bodying sessions. I liked the product overall.

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http://www.Harvestmoonguitars.com

Filippo, I have used it over zpoxy a couple of times. It works well, and looks nice, but I think it sort of goes against the reason for using a french polish as a finish, though. The zpoxy is sort of thick, and the reason, at least in my opinion, for using french polish, is to create a very thin, flexible surface film.

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I believe, when French polishing, one would sand back to wood, only leaving Zpoxy in the pores, therefore not building any epoxy on the surface.

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Waddy

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