Darryl Keil Last Activity 2026-04-25 12:44 PM
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Paul Carroll

 
Subject : curly maple veneer changing color
Posted : 2003-03-14 9:17 PM
Post #28758
Twice now, I have encountered a strange finishing problem. On both occasions I used curly maple veneer on a man-made substrate. I used PVA glue (Titebond). On one occasion, I let the glue dry on the veneer and the substrate and then ironed it on. On the second occasion, I used clamps and cauls. The only finish I applied was blond shellac to give a light amber color. Within several weeks, parts of the curly maple developed a very unpleasant pinkish to reddish coloring. I don't think it has anything to do with the shellac. I have sanded one of the surfaces and the pink coloring does not go away, suggesting that the entire veneer is affected. What happened? Is it the glue? Any thoughts on correcting it? One of the projects was a labor of love and I hate to see it ruined. Thanks so much. I am one worried woodworker. Best, Paul Carroll



 
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Darryl Keil

 
Subject : curly maple veneer changing color
Posted : 2003-03-16 12:01 PM
Post #28760 - In reply to #28758
Paul,Curly maple often developes this problem which is usually caused by the glue. Because a part of every curl is close to end grain the glue saturates and comes through in these areas. My question is this, did you use titebond II glue? There is a chemical crosslinker in it that makes it a type 1 rated glue. This can cause the pink color you are getting. It may be something else but this is my first guess.The only thing you can do at this point is to remove the finish and either stain to cover it up or bleach it to wash it out.SincerelyDarryl Keil: : Twice now, I have encountered a strange finishing problem. On both: occasions I used curly maple veneer on a man-made substrate. I used PVA glue: (Titebond). On one occasion, I let the glue dry on the veneer and the substrate and then: ironed it on. On the second occasion, I used clamps and cauls. The only finish I applied: was blond shellac to give a light amber color. Within several weeks, parts of the curly: maple developed a very unpleasant pinkish to reddish coloring. I don't think it has: anything to do with the shellac. I have sanded one of the surfaces and the pink coloring: does not go away, suggesting that the entire veneer is affected. : What happened? Is it the glue? Any thoughts on correcting it? One of the projects was a: labor of love and I hate to see it ruined. Thanks so much. I am one worried woodworker.: Best, Paul Carroll




 
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Paul Carroll

 
Subject : curly maple veneer changing color
Posted : 2003-03-16 1:17 PM
Post #28762 - In reply to #28760
Darryl,First, thanks so much for the response. Yes, I used Titebond II. A few questions: Can I use a white PVA glue without the problem? How would you bleach the curly maple? Will bleaching eliminate the natural color of the color maple along with the offending pinkish color? Again, thanks so much. You are the first to have an idea about what the problem might be!!!! Best, Paul




 
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Darryl Keil

 
Subject : curly maple veneer changing color
Posted : 2003-03-16 6:19 PM
Post #28763 - In reply to #28762
Paul,You can use white or yellow glue and have a successful pressing. The problem is in the crosslinker which is only in PVA glues that have the type 1 waterproof rating. If you get a white glue that has the crosslinker it will cause the same problem. Just make sure the PVA glue does not say waterproof anywhere on the label. I would suggest you use regular yellow glue next time as most yellow glues dry slightly harder than a white glue. With veneer you want a hard glue line. Yellow glue is no where near as hard as urea glues but its still harder than most white glues.As far as the bleaching goes, yes it will make the veneer whiter but you won't loose the grain effect just the color tone. Bleaching can look quite nice if done correctly. I suggest a test on sample first to get the feel of the process. Follow the direction on the two bottles it should be explain clearly.SincerelyDarryl Keil: Darryl,: First, thanks so much for the response. Yes, I used Titebond II. A few questions: Can I use a white PVA glue without the problem? How would you bleach the curly maple? Will bleaching eliminate the natural color of the color maple along with the offending pinkish color? Again, thanks so much. You are the first to have an idea about what the problem might be!!!! Best, Paul
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