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PostPosted: Sun May 13, 2007 3:39 pm 
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Koa
Koa

Joined: Tue Jan 25, 2005 3:18 pm
Posts: 785
Location: United States
I'm finishing a guitar with z-poxy for the filler/sealer, and will top it with nitro. This is my first time using z-poxy. For those who use z-poxy with nitro, do you prefer to use a layer of shellac between the z-poxy and the lacquer, and why/why not? (I have left a film of z-poxy on the surface, and not sanded the z-poxy back to wood, because I really like the hue and pop it gave to the EIR I'm using.)

Thanks.


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PostPosted: Sun May 13, 2007 10:40 pm 
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Brazilian Rosewood
Brazilian Rosewood
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Joined: Tue Jul 05, 2005 10:53 pm
Posts: 2198
Location: Hughenden Valley, England
Kelby,

If you are cautious and risk averse then put a shellac coat on the Z-poxy before applying the nitro. This is on the basis that pretty much everything sticks to shellac - the shellac sticks to the Z-poxy and the nitro to the shellac.

If you like risks then go with the nitro directly onto the Z-poxy. It's going to depend on the nitro you are using but there could (I say could) be adhesion issues, and just to be interesting (as most things in guitar making are ) these adhesion issues may not surface for a year or so down the line.

Best bet is to check with the manufacturer of the nitro.

I have read in various places that you should never put shellac under Z-poxy as the Z-poxy doesn't stick to shellac but shellac will stick to Z-poxy that is on wood (interesting one). I have never tested this out so can't confirm or deny this one.

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PostPosted: Mon May 14, 2007 12:35 am 
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Koa
Koa

Joined: Wed Jun 01, 2005 6:35 am
Posts: 1325
Location: Kings Mtn., NC, USA
First name: Bill
Last Name: Greene
City: Kings Mountain
State: North Carolina
Zip/Postal Code: 28086
Country: USA
Focus: Build
Status: Amateur
Aha! I asked this exact question this week to a guy who is going to "teach" me to finish with nitro...and he said there was no adhesion issues between zpoxy and nitro.

Hmmm....I'll be watching this thread closely. Perfect timing.

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PostPosted: Mon May 14, 2007 1:15 am 
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Brazilian Rosewood
Brazilian Rosewood
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Joined: Thu Jan 06, 2005 7:29 am
Posts: 3840
Location: England
Why not just put shellac over the Z-poxy and leave it at that. That would be (and is) my choice.

Colin


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PostPosted: Mon May 14, 2007 6:37 am 
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Cocobolo
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Joined: Tue Sep 12, 2006 12:43 pm
Posts: 147
Location: United States
If your unsure or worried the lacq. won't stick to the epoxy, why not lay a coat of vynal sealer between the two? Does that make sense? I'm about to spray over zpoxy, and wonder if this is a good idea.


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