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Fasterthanlight
 Post subject: Epoxy OVER Nitro
PostPosted: Sat Jan 06, 2018 4:55 pm 
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Cocobolo
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First name: Gary
Last Name: Leddington
Focus: Build
Status: Amateur
Does anyone foresee problems putting a thin layer of epoxy over nitro then finishing with nitro again?

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Glen H
 Post subject: Re: Epoxy OVER Nitro
PostPosted: Sat Jan 06, 2018 5:39 pm 
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Location: United States
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Why would you need to?
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Fasterthanlight
 Post subject: Re: Epoxy OVER Nitro
PostPosted: Sat Jan 06, 2018 6:21 pm 
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To fill some dents in a backstrip i missed before spraying...

Anyway... any problems forseen?

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Mike OMelia
 Post subject: Re: Epoxy OVER Nitro
PostPosted: Sat Jan 06, 2018 7:15 pm 
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Do not do that. Show some pictures and let’s go from there
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Glen H
 Post subject: Re: Epoxy OVER Nitro
PostPosted: Sat Jan 06, 2018 7:51 pm 
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I routinely spray a wash coat of nitro on back and sides before pore filling with epoxy just to trap the dust but I wouldn’t fill with epoxy on a full finish. Just drop fill with nitro.
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Mike OMelia
 Post subject: Re: Epoxy OVER Nitro
PostPosted: Sat Jan 06, 2018 9:51 pm 
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If the dents are small, drop fill with nitro. If this involves big dents, I dunno. But I would not use epoxy for this. Pics of dents please.
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Fasterthanlight
 Post subject: Re: Epoxy OVER Nitro
PostPosted: Sun Jan 07, 2018 7:49 am 
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Cant send pics right now... but thanks for the tips.... i will drop fill and build it up with nitro....

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Fasterthanlight
 Post subject: Re: Epoxy OVER Nitro
PostPosted: Sun Jan 07, 2018 8:47 am 
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However... now i am curious... what would happen if you put epoxy over nitro, level sanded then then re-finished with nitro?

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Clay S.
 Post subject: Re: Epoxy OVER Nitro
PostPosted: Sun Jan 07, 2018 10:00 am 
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Brazilian Rosewood
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"However... now i am curious... what would happen if you put epoxy over nitro, level sanded then then re-finished with nitro?"

It's hard to say. There are a lot of different formulations of epoxy. Dissimilar finishes "move" differently with changes in temperature and humidity. Generally it is not recommended to use a softer finish under a harder one, although a very thin coat of shellac seems to be an exception to this rule. Putting a finish both over and under another might be asking for trouble. But then again you might get away with it.
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Ken Lewis
 Post subject: Re: Epoxy OVER Nitro
PostPosted: Sun Jan 07, 2018 12:11 pm 
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"However... now i am curious... what would happen if you put epoxy over nitro, level sanded then then re-finished with nitro?"

The main reason I wouldn't do it is that it might show after final buff. Not saying that it would. Drop fill with nitro I would consider
to be the safe route.

Ken
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AndyB
 Post subject: Re: Epoxy OVER Nitro
PostPosted: Sun Jan 07, 2018 5:45 pm 
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That is the wrong way to address the issue. Take some nitro lacquer and set it out for a few days. Like 1/4 oz in a cup. I keep a small squeeze bottle (1/2 I want to say) with nitro that has evaporated out to where it is more of a thick paste. It should flow like molasses. You can use that to fill the voids. It will melt into the existing lacquer and shrink some. You need to give it 3 weeks (ideally) to cure before scraping flat, wet sanding, and buffing.

Andy
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Mike OMelia
 Post subject: Re: Epoxy OVER Nitro
PostPosted: Sun Jan 07, 2018 6:05 pm 
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Brazilian Rosewood
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Fasterthanlight wrote:
However... now i am curious... what would happen if you put epoxy over nitro, level sanded then then re-finished with nitro?

It could end up looking like crap. Seriously. Can you imagine a major builder doing that? The suggestion above about evaporating some nitro down to molasses viscosity is precisely what I do. Keep it in a squeeze bottle suitable for nitro (nylon). Something like that will create an invisible fix. Unless it’s on the top. The downside is u really need to spend the time on the cure. A warm hairdryer could speed it up. Indirect application of course.
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Haans
 Post subject: Re: Epoxy OVER Nitro
PostPosted: Mon Jan 08, 2018 9:24 am 
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Brazilian Rosewood
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Joined: Wed Apr 08, 2009 9:34 am
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The cardinal rule of cabinetmaking is NEVER mix finishes.


These users thanked the author Haans for the post: Ken Jones (Tue Jan 09, 2018 10:54 pm)
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