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PostPosted: Sat Oct 03, 2020 9:27 pm 
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Walnut
Walnut

Joined: Mon Sep 28, 2020 2:53 pm
Posts: 13
Hi all

I am working on a guitar that need a section of the top replaced. A nice sized piece about 3x8. The current finish is polyurethane. What would be best finish for the repair? Is nitrocellulose an option or should I use polyurethane. I will need to feather it into the existing finish. Any thoughts about EM 6000 from target coatings?

thanks


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PostPosted: Mon Oct 05, 2020 10:30 am 
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Brazilian Rosewood
Brazilian Rosewood

Joined: Thu Nov 04, 2010 1:46 pm
Posts: 2124
First name: Freeman
Last Name: Keller
Focus: Build
Status: Amateur
Hi Kevdart and welcome to OLF. I'm not going to try to answer your question as I have had very little luck with this, but I'm going to watch what others have done. I've reached the point where I usually turn down repairs involving any of the modern poly finishes because I know I won't be satisfied with the results.


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PostPosted: Mon Oct 05, 2020 11:32 am 
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Brazilian Rosewood
Brazilian Rosewood

Joined: Fri Aug 19, 2005 4:02 am
Posts: 3227
Location: The Woodlands, Texas
First name: Barry
Last Name: Daniels
Are you sure you need to patch the soundboard? There may be alternatives. How about a picture.


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PostPosted: Mon Oct 05, 2020 6:21 pm 
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Koa
Koa

Joined: Mon Feb 13, 2012 8:49 pm
Posts: 951
First name: peter
Last Name: havriluk
City: granby
State: ct
Zip/Postal Code: 06035
Country: usa
Focus: Build
Status: Amateur
Time to manage expectation and not promise the impossible. Or the uneconomic.

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Peter Havriluk


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PostPosted: Mon Oct 05, 2020 7:13 pm 
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Walnut
Walnut

Joined: Mon Sep 28, 2020 2:53 pm
Posts: 13
Thanks for the replies everyone

I guess I should not have said a patch. The piece is missing so it must be replaced -Although it sounded ok with it missing strangely enough. I do agree that the repair is probably not worth it but its for me and more or less a learning experience. I do not expect anything approaching perfection but we will see how it goes.


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PostPosted: Mon Oct 05, 2020 8:05 pm 
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Contributing Member
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Joined: Sun Mar 06, 2011 12:04 am
Posts: 5743
First name: Chris
Last Name: Pile
City: Wichita
State: Kansas
Country: Good old US of A
Focus: Repair
Status: Professional
Wow. A whole new top would be more appropriate.

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"Act your age, not your shoe size" - Prince


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PostPosted: Tue Oct 06, 2020 10:50 am 
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Brazilian Rosewood
Brazilian Rosewood

Joined: Thu Nov 04, 2010 1:46 pm
Posts: 2124
First name: Freeman
Last Name: Keller
Focus: Build
Status: Amateur
Actually the repair might not be all that hard. I would approach it in these steps. Glue the present top back to the kerfing , make sure the braces are tight while you can get inside. Glue a piece of reinforcement to the present top leaving half of it extending into the void. It looks like the binding is still in place, cut a piece of wood to fit against the top and inside the binding. It should just drop in place. You will need several long clamps to reach the reinforcement thru the sound hole and several spool or quick clamps for the rim.

The top looks like cedar to me but it could be spruce. Rather than trying to match the finish and deal with something that I don't know, I would probably strip the top and refinish it - either FP or nitro would work. You might be able to do it with some of the new wipe on polys - I have no experience with them so I can't say. When you cut out the piece to fill the hole keep the scraps and use them to practice your finishing technique.

Good luck



These users thanked the author Freeman for the post: dzsmith (Thu Oct 08, 2020 10:15 am)
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