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| U-Beaut shellac and Zpoxy http://www.luthiersforum.com/forum/viewtopic.php?f=10101&t=40232 |
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| Author: | Chris.Conery [ Wed May 01, 2013 5:47 pm ] |
| Post subject: | Re: U-Beaut shellac and Zpoxy |
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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| Author: | Trevor Gore [ Wed May 01, 2013 5:48 pm ] |
| Post subject: | Re: U-Beaut shellac and Zpoxy |
Filippo Morelli wrote: I know Trevor is using it over epoxy (West?) 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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| Author: | WaddyThomson [ Wed May 01, 2013 9:15 pm ] |
| Post subject: | Re: U-Beaut shellac and Zpoxy |
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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| Author: | johnparchem [ Wed May 01, 2013 9:33 pm ] |
| Post subject: | Re: U-Beaut shellac and Zpoxy |
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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| Author: | A.Hix [ Thu May 02, 2013 9:13 am ] |
| Post subject: | Re: U-Beaut shellac and Zpoxy |
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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| Author: | WaddyThomson [ Thu May 02, 2013 1:30 pm ] |
| Post subject: | Re: U-Beaut shellac and Zpoxy |
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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