Darryl Keil Last Activity 2024-10-10 3:42 PM
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PBof Sunapee

Posts: 2

Joined: 2011-07-22
Location: Sunapee, NH

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Subject : Bleed through
Posted : 2011-07-22 7:26 AM
Post #36435
Hello, I am pressing wenge veneer on to torsion boxes with Titebond II and I had severe bleed through of the glue. Any suggestions on how to cure this - I've got at least 10 more panels to glue? Is it simply reducing the vacuum pressure and if so to what pressure? Thanks


 
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mike mcnerney

Posts: 87

Joined: 2003-07-17
Location: ottawa ontario

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Subject : RE: Bleed through
Posted : 2011-07-22 8:11 AM
Post #36436 - In reply to #36435
Ah yes bleed through. Currently I am doing a bunch of 'ropey chery' 1/40
And I have experienced some bleed. when I put solvent on it to simulate finish it doesn't look any different than panels without bleed.
Is wenge thinner? I don't think it will matter, with such a dark wood especially.
The question is why does it bleed. I think it is too much glue applied.
I recently bought the hopper applicator, which is so much cleaner, faster, more even.
On my same project I hace some thicker wenge edging & I experimented with a piece to see if would go darker yet. I pore filled with timbermate black & the filler not only filled the pores but stained the ligher portion of the wenge to a dark grey. But with finish it makes no difference in colour.
I would not reduce the vac pressure.
Mike McNerney



 
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PBof Sunapee

Posts: 2

Joined: 2011-07-22
Location: Sunapee, NH

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Subject : RE: Bleed through
Posted : 2011-07-22 11:13 AM
Post #36437 - In reply to #36436
Thank you Mike. I did a test with less glue and less pressure with much better results but some bleed through. I was not planning on filling the grain but I might not have much choice. What kind of solvent did you use. Thank you


 
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mike mcnerney

Posts: 87

Joined: 2003-07-17
Location: ottawa ontario

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Subject : RE: Bleed through
Posted : 2011-07-22 11:39 AM
Post #36438 - In reply to #36437
I've used denatured alcohol which evaporates too fast so now I use a little low odor mineral spirits.
I wasn't suggesting a grain fill but trying to illustrate a point that even a little stain on wenge does not make a difference.
MM


 
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Darryl Keil

Posts: 1453

Joined: 2003-05-22
Location: Maine

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Subject : RE: Bleed through
Posted : 2011-07-23 9:52 AM
Post #36440 - In reply to #36437
PB,

Bleed through on raw veneer, especially Wenge, is to be expected. At most a little spotting here and there is normal. If you have 25% or more of the surface of the veneer glazed with bleed through then you're using too much glue. I would be careful about dialing back the vacuum pressure. A little bit is OK but you don't want to compromise the glue bond by having low pressure.

All you have to do with bleed through is scrape it clean with a cabinet scraper and then sand. As long as its thoroughly off the surface it will not blotch the veneer when you put the finish on.

Darryl Keil


 
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Don Stephan

Posts: 825

Joined: 2003-07-18
Location: Cincinnati, Ohio

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Subject : RE: Bleed through
Posted : 2011-07-23 6:21 PM
Post #36441 - In reply to #36435
Another option is to use urea resin glue like Unibond and add some dark brown Transtint so the glue is about the same color as the wood. Because wenge is so open pored I would expect much more bleedthrough than with tighter woods.
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