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| Epoxy OVER Nitro http://mowrystrings.luthiersforum.com/forum/viewtopic.php?f=10101&t=50150 |
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| Author: | Fasterthanlight [ Sat Jan 06, 2018 4:55 pm ] |
| Post subject: | Epoxy OVER Nitro |
Does anyone foresee problems putting a thin layer of epoxy over nitro then finishing with nitro again? |
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| Author: | Glen H [ Sat Jan 06, 2018 5:39 pm ] |
| Post subject: | Re: Epoxy OVER Nitro |
Why would you need to? |
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| Author: | Fasterthanlight [ Sat Jan 06, 2018 6:21 pm ] |
| Post subject: | Re: Epoxy OVER Nitro |
To fill some dents in a backstrip i missed before spraying... Anyway... any problems forseen? |
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| Author: | Mike OMelia [ Sat Jan 06, 2018 7:15 pm ] |
| Post subject: | Re: Epoxy OVER Nitro |
Do not do that. Show some pictures and let’s go from there |
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| Author: | Glen H [ Sat Jan 06, 2018 7:51 pm ] |
| Post subject: | Re: Epoxy OVER Nitro |
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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| Author: | Mike OMelia [ Sat Jan 06, 2018 9:51 pm ] |
| Post subject: | Re: Epoxy OVER Nitro |
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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| Author: | Fasterthanlight [ Sun Jan 07, 2018 7:49 am ] |
| Post subject: | Re: Epoxy OVER Nitro |
Cant send pics right now... but thanks for the tips.... i will drop fill and build it up with nitro.... |
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| Author: | Fasterthanlight [ Sun Jan 07, 2018 8:47 am ] |
| Post subject: | Re: Epoxy OVER Nitro |
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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| Author: | Clay S. [ Sun Jan 07, 2018 10:00 am ] |
| Post subject: | Re: Epoxy OVER Nitro |
"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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| Author: | Ken Lewis [ Sun Jan 07, 2018 12:11 pm ] |
| Post subject: | Re: Epoxy OVER Nitro |
"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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| Author: | AndyB [ Sun Jan 07, 2018 5:45 pm ] |
| Post subject: | Re: Epoxy OVER Nitro |
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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| Author: | Mike OMelia [ Sun Jan 07, 2018 6:05 pm ] |
| Post subject: | Re: Epoxy OVER Nitro |
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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| Author: | Haans [ Mon Jan 08, 2018 9:24 am ] |
| Post subject: | Re: Epoxy OVER Nitro |
The cardinal rule of cabinetmaking is NEVER mix finishes. |
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