Darryl Keil Last Activity 2025-09-09 11:09 AM
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Mike Noble

 
Subject : glue stains, finishing
Posted : 2004-03-06 2:56 PM
Post #31344
Hello

I have veneered a series of curly maple panels using Unibond 800, blonde glue. AThere was very little bleed through after removing from the vacuum bag. After scraping and sanding there are some very light yellow glue stains remaining. Will these affect the finishing? If so what do you suggest? I am planning on finishing with a conversion varnish.

Thx

Mike Noble


 
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Brian Gray

Posts: 339

Joined: 2004-01-21
Location: Sandusky, OH

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Subject : RE: glue stains, finishing
Posted : 2004-03-07 8:44 AM
Post #31345 - In reply to #31344
I usually wipe on a quick coat of shellac, and then use some famowood filler to even out cracks, especially in marquetry. Use acetone to thin the famowood. the reason for the shellac coat is that it will act as a barrier to the acetone.

this evens out most imperfections, but is not a cure for everything related to glue-squeeze....sometimes there's just stuff that I have to live with...that's why I either use Unibond that is very similar to the background veneer in color, or use some transtint to dye it to a similar color....

I've never had a problem with unibond effecting the final finish.


 
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Mike Noble

 
Subject : RE: glue stains, finishing
Posted : 2004-03-09 9:12 AM
Post #31354 - In reply to #31345
Hi Brian,

Does your experience with the filler and shellac refer to curly maple?

Thx




 
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Darryl Keil

Posts: 1455

Joined: 2003-05-22
Location: Maine

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Subject : RE: glue stains, finishing
Posted : 2004-03-08 7:14 PM
Post #31349 - In reply to #31344
Mike,

I have found that Unibond 800 can occasionally chemically stain curly maple a yellowish color. This happens just in the curl area because the curly grain absorbs the glue so much. On regular maple this does not happen because the closed grain nature of maple does not saturate, only on curly maple. There is something in maple that reacts with the Unibond chemically, and not on all curly maples either. Enough though that I recommend a test for anyone doing curly maple veneering with Unibond.

The shellac may even it out some. The other option would be to bleach it. Unfortunately you will not be able to sand it out, or at least I doubt it.

Sincerely
Darryl Keil


 
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Mike Noble

 
Subject : RE: glue stains, finishing
Posted : 2004-03-09 9:21 AM
Post #31355 - In reply to #31349
Hi Darryl

Would it help if the glue was lighter - ie closer to white? Is there anyway to lighten the colour of the glue? The blonde Unibond is actually light brown, at least in the glue I have. My glue is about 4 months old.

Thx

Mike


 
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Darryl Keil

Posts: 1455

Joined: 2003-05-22
Location: Maine

User Profile 
Subject : RE: glue stains, finishing
Posted : 2004-03-12 9:32 PM
Post #31365 - In reply to #31355
Mike,

In your case I assume it is a chemical staining which a lighter glue would not fix. The color of the glue really only matters on open grain woods where the glue will fill the pours. On maple this really does not apply, you could have used the medium catalyst just as well. You could say that it would fill the seams but if I have seems that are open enough for glue to fill I redo them.

Sincerely
Darryl Keil


 
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Mike Noble

 
Subject : RE: glue stains, finishing
Posted : 2004-03-13 1:39 PM
Post #31367 - In reply to #31365
Thanks Darryl

I went with a weak analine dye prior to finishing, it evened things out. You are right, it is the curls that are effected the most. By the way, your vacuum press was one of the best additions to my shop!

Mike
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