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I've used Zpoxy both ways prior to FPing...

1) sanding down to bare wood
2) Leaving a very thin, sanded smooth surface of ZPoxy

You have to make a commitment to either way. Having part of a surface sanded to bare wood while the remainder is coated will show an inconsistant surface and color once the final finish is completed. Either way works but I prefer to leave the surface coated. I get a smoother surface and I like the color and pop that Zpoxy imparts.

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JJ
Napa, CA
http://www.DonohueGuitars.com

JJ's correct....leaving patches of wood bare will lead to a patchy finish.

[QUOTE=JJ Donohue] Having part of a surface sanded to bare wood while the remainder is coated will show an inconsistant surface and color once the final finish is completed. [/QUOTE]

This will also be a problem if you sand throuh the finish and down to the wood later, and it is another reason I don't like the idea of leaving a layer of epoxy under the finish.

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Rian Gitar og Mandolin