Darryl Keil Last Activity 2025-09-09 11:09 AM
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Don Stephan

Posts: 825

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

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Subject : Wrinkling After Flattening?
Posted : 2009-06-12 5:38 PM
Post #35500

I've had experiences both ways, but seldom flatten veneer and never thought to use vacuum bag when I did. And I've always used the home-brew formulation rather than a commercial product. So I have little meaningful experience.
Are there certain veneer species/grain/figure combinations that regularly become wrinkly again after flattening, and if so does a second go-round solve the problem? Does a commercial formulation really give better results than the water/glycerin/dna/PVA glue home-brew?
Thanks.
Don Stephan


 
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Darryl Keil

Posts: 1455

Joined: 2003-05-22
Location: Maine

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Subject : RE: Wrinkling After Flattening?
Posted : 2009-06-14 6:58 PM
Post #35507 - In reply to #35500

Don,

In general I don't have problems with veneers wrinkling after flattening but that depends on your definition of wrinkling and how long you let them sit around afterwords. Veneers like mahogany crotch will definitely get wavy again after flattening. Once I finish flattening I get right to pressing as soon as possible. If not I keep the veneers weighted or clamped between boards.

As far as home brew verses GF20, which is really the only commercial flattener around, I have not found the GF20 that much better, just more convenient since its all mixed up for you except for the PVA glue, if one adds that.

Darryl Keil


 
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Brad

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Joined: 2008-04-22

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Subject : RE: Wrinkling After Flattening?
Posted : 2009-06-15 12:44 PM
Post #35510 - In reply to #35500

My first attempts with the home brew did not work out great so I am a GF20 convert. I tried with both a Bubinga swirl and Makore Crotch, and after flattening/drying with the home brew it still wouldnt press into my router clamp properly for cutting. I did follow Darryl's recommendations, but, it still could have been my mixture. I really do not know. I will say that the Makore crotch turns out flat as a can be after the GF20 is applied (I have some pics if you like). I did find it messier to work with the home brew due to the glue and finding spots to hang up the screens for drying wasnt the handiest either in my space. With the GF20 I use paper towel once or twice and then toss it out. Thats just a cost of working with a burl/crotch material. The downside of the GF20 is you only have about 24hrs from application to getting the stock pressed, as you will notice the stock reverting to its wavy form and it starts to become harder to work with. Joe (woodworker) claims his brew last longer, but I didnt find that when I tried his. I am pretty sure his is the same as GF20, just labelled for him. In the end, you will probably have to try it out yourself. Veneer Systems will ship you some GF20 in short order.

As for re-softening, I have not found that to be a problem, but I am usually pretty careful to plan my project to avoid the added time/cost of re-softening. GF20 is not incredibly easy for me to get and the cost does add up a bit.

I have only tried a few burl/crotches thus far. The Bubinga swirl stock I have is a bit thicker and I still have not managed to get it flat enough. The Makore works out perfectly, and I just got in some Carpathian Burl that I know is going to work out perfectly flat too.

Brad


 
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Don Stephan

Posts: 825

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

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Subject : RE: Wrinkling After Flattening?
Posted : 2009-06-15 7:54 PM
Post #35512 - In reply to #35510

Thanks Darryl and Brad for the feedback. I hope some more will contribute.
My last experience, perhaps 15 years ago now, was on alive ash burl. I was pressing mechanically and changing newsprint a couple times a day. When I removed the clamps each time to change paper, the veneer would start to buckle again. That was the one time I tried iron and PVA, and two or three of the 8 joints pulled apart under the iron (i.e. shrunk) so I always suspected the veneer wasn't completely dry. That might have been why the veneer kept wanting to buckle - it was still drying? Don't know.
Don


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