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 Post subject: Finish repair advice
PostPosted: Sat Dec 21, 2019 10:22 pm 
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Cocobolo
Cocobolo

Joined: Sun Nov 09, 2008 4:29 pm
Posts: 123
Location: Markham, ON (Canada)
First name: Charlton
Last Name: Wang
Focus: Build
Status: Amateur
Hi,

I have a friend who had an accident with her classical guitar where the top and binding separated and suffered some damage. I managed to get everything all fixed up but now I'm at the point of having to deal with fixing the finish. I tried to contact the manufacturer to determine what sort of finish is being use but there was no response (expected). I'm wondering if anyone has any advice on how to best approach fixing finish like this. I have actually scraped a bit of the finish down and my intention was just to use an airbrush to spray some EM6000 and feather the finish in but I'm now having reservations about whether this would hold up long-term with the existing finish being unknown. Assuming the finish is something modern (like some sort of UV-cured finish), would applying EM6000 over the existing finish (scuffing the gloss, of course) and feathering be doable?

Thanks!

Charlton


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 Post subject: Re: Finish repair advice
PostPosted: Sat Dec 21, 2019 10:52 pm 
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Brazilian Rosewood
Brazilian Rosewood

Joined: Sun Mar 30, 2008 8:20 am
Posts: 4360
If you mention the manufacturer's name and about how old the guitar is there may be someone here who could tell you what the finish is and how best to repair it.


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 Post subject: Re: Finish repair advice
PostPosted: Sat Dec 21, 2019 11:21 pm 
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Cocobolo
Cocobolo

Joined: Sun Nov 09, 2008 4:29 pm
Posts: 123
Location: Markham, ON (Canada)
First name: Charlton
Last Name: Wang
Focus: Build
Status: Amateur
HI Clay,

Good point. The company is Almansa and I gather the guitar is probably 3-4 years old.

Thanks,
Charlton


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 Post subject: Re: Finish repair advice
PostPosted: Sat Dec 21, 2019 11:43 pm 
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Contributing Member
Contributing Member

Joined: Thu Sep 22, 2005 11:57 am
Posts: 324
Location: Los Osos CA
Focus: Repair
A fair guess is that it's got polyester or polyurethane on it, but knowing that doesn't help much.
Photos would help, but what I'd likely do is wipe the affected area with some very pale shellac first,
then drop-fill the hollows you'll probably have with CA, then wipe on a little more shellac.
Various approaches to blend *a little* after that.
It won't be perfect, but IMO spraying something like that often creates more problems than it solves.

One opinion.


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 Post subject: Re: Finish repair advice
PostPosted: Sun Dec 22, 2019 8:25 am 
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Brazilian Rosewood
Brazilian Rosewood
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Joined: Mon Dec 27, 2010 9:06 pm
Posts: 2739
Location: Magnolia DE
First name: Brian
Last Name: Howard
City: Magnolia
State: Delaware
Zip/Postal Code: 19962
Country: United States
Focus: Repair
Status: Professional
Endurovar will leave witness lines at the edge of the repaired section. There is also a real risk of sanding through the original finish just beyond the edge of the new material when level sanding to buff.

Makes no difference what the finish is if it is a closed polymer system (meaning it will not redisolv with solvent). Repair options are the same. Most will have nothing more than CA to work with that will work. But a good auto body cut in repair clear and an airbrush can make a quite seemles repair in most of these finishes.

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Brian

You never know what you are capable of until you actually try.

https://www.howardguitarsdelaware.com/


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