Official Luthiers Forum!

Owned and operated by Lance Kragenbrink
It is currently Thu Mar 28, 2024 4:43 pm


All times are UTC - 5 hours


Forum rules


Be nice, no cussin and enjoy!




Post new topic Reply to topic  [ 13 posts ] 
Author Message
 Post subject: Epoxy OVER Nitro
PostPosted: Sat Jan 06, 2018 4:55 pm 
Offline
Cocobolo
Cocobolo

Joined: Wed May 04, 2016 4:17 am
Posts: 150
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?

_________________
www.leddingtonguitars.com


Top
 Profile  
 
 Post subject: Re: Epoxy OVER Nitro
PostPosted: Sat Jan 06, 2018 5:39 pm 
Offline
Koa
Koa

Joined: Mon Jul 11, 2005 5:17 am
Posts: 995
Location: United States
City: Tyler
State: Texas
Why would you need to?


Top
 Profile  
 
 Post subject: Re: Epoxy OVER Nitro
PostPosted: Sat Jan 06, 2018 6:21 pm 
Offline
Cocobolo
Cocobolo

Joined: Wed May 04, 2016 4:17 am
Posts: 150
First name: Gary
Last Name: Leddington
Focus: Build
Status: Amateur
To fill some dents in a backstrip i missed before spraying...

Anyway... any problems forseen?

_________________
www.leddingtonguitars.com


Top
 Profile  
 
 Post subject: Re: Epoxy OVER Nitro
PostPosted: Sat Jan 06, 2018 7:15 pm 
Offline
Brazilian Rosewood
Brazilian Rosewood
User avatar

Joined: Wed Feb 20, 2008 9:12 pm
Posts: 6977
First name: Mike
Last Name: O'Melia
City: Huntsville
State: Alabama
Focus: Build
Status: Semi-pro
Do not do that. Show some pictures and let’s go from there


Top
 Profile  
 
 Post subject: Re: Epoxy OVER Nitro
PostPosted: Sat Jan 06, 2018 7:51 pm 
Offline
Koa
Koa

Joined: Mon Jul 11, 2005 5:17 am
Posts: 995
Location: United States
City: Tyler
State: Texas
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.


Top
 Profile  
 
 Post subject: Re: Epoxy OVER Nitro
PostPosted: Sat Jan 06, 2018 9:51 pm 
Offline
Brazilian Rosewood
Brazilian Rosewood
User avatar

Joined: Wed Feb 20, 2008 9:12 pm
Posts: 6977
First name: Mike
Last Name: O'Melia
City: Huntsville
State: Alabama
Focus: Build
Status: Semi-pro
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.


Top
 Profile  
 
 Post subject: Re: Epoxy OVER Nitro
PostPosted: Sun Jan 07, 2018 7:49 am 
Offline
Cocobolo
Cocobolo

Joined: Wed May 04, 2016 4:17 am
Posts: 150
First name: Gary
Last Name: Leddington
Focus: Build
Status: Amateur
Cant send pics right now... but thanks for the tips.... i will drop fill and build it up with nitro....

_________________
www.leddingtonguitars.com


Top
 Profile  
 
 Post subject: Re: Epoxy OVER Nitro
PostPosted: Sun Jan 07, 2018 8:47 am 
Offline
Cocobolo
Cocobolo

Joined: Wed May 04, 2016 4:17 am
Posts: 150
First name: Gary
Last Name: Leddington
Focus: Build
Status: Amateur
However... now i am curious... what would happen if you put epoxy over nitro, level sanded then then re-finished with nitro?

_________________
www.leddingtonguitars.com


Top
 Profile  
 
 Post subject: Re: Epoxy OVER Nitro
PostPosted: Sun Jan 07, 2018 10:00 am 
Offline
Brazilian Rosewood
Brazilian Rosewood

Joined: Sun Mar 30, 2008 8:20 am
Posts: 5924
"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.


Top
 Profile  
 
 Post subject: Re: Epoxy OVER Nitro
PostPosted: Sun Jan 07, 2018 12:11 pm 
Offline
Contributing Member
Contributing Member

Joined: Sat Aug 27, 2011 1:59 pm
Posts: 374
First name: Ken
Last Name: Lewis
City: Mt. Pearl
State: NL
Country: Canada
Focus: Build
Status: Amateur
"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


Top
 Profile  
 
 Post subject: Re: Epoxy OVER Nitro
PostPosted: Sun Jan 07, 2018 5:45 pm 
Offline
Cocobolo
Cocobolo

Joined: Fri Jan 15, 2016 9:04 pm
Posts: 315
First name: Andy
Status: Professional
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


Top
 Profile  
 
 Post subject: Re: Epoxy OVER Nitro
PostPosted: Sun Jan 07, 2018 6:05 pm 
Offline
Brazilian Rosewood
Brazilian Rosewood
User avatar

Joined: Wed Feb 20, 2008 9:12 pm
Posts: 6977
First name: Mike
Last Name: O'Melia
City: Huntsville
State: Alabama
Focus: Build
Status: Semi-pro
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.


Top
 Profile  
 
 Post subject: Re: Epoxy OVER Nitro
PostPosted: Mon Jan 08, 2018 9:24 am 
Offline
Brazilian Rosewood
Brazilian Rosewood

Joined: Wed Apr 08, 2009 9:34 am
Posts: 3081
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)
Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 13 posts ] 

All times are UTC - 5 hours


Who is online

Users browsing this forum: No registered users and 65 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Jump to:  
Powered by phpBB® Forum Software © phpBB Group
phpBB customization services by 2by2host.com