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Darryl Keil
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Dear Jerry,Whether you flatten your veneer or not you should use a urea glue for pressing mahoganycrotch. By the way, Unibond 800 is a urea glue.If you flatten a veneer it is not always the rule that you use urea when pressing. It reallydepends on the veneer and the situationwhether urea is used.As far as whether you need to flatten or not depends on a few factors. The veneer has tobe flat enough to be able to tape the joints together without struggling to much. Whenpressing it can't be so wavy the veneer cracks and on larger panels the veneer needs to beflatter than on small ones. The problem is, knowing whether you need to or not issomewhat subjective and comes with experience. I will say this, Mahogany crotch is adifficult veneer that is already under stress and cracks easily. My advise is if you are at allconcerned with the wavyness, flatten it. Things will only go easier. Make sure the veneeris completely dry again before pressing with it.You could press the crotch onto a backer but its not a must. As long as your solid wood isunder the veneer only a small amount, like 1/8" and you glue the solid to the MDF withurea glue you will be alright. Doing a two ply is the premium way but you don't have todo it. A general rule is that the face veneer does not go over any seams or joints. So if youare going to skip the two ply you need to use urea glue on the solid edging so the jointyou are veneering over is more rigid. If you decide to use two ply, use a mahogany backerabout the same thickness as the veneer. If you use poplar the lighter color will showaround the edges.My overall recomendation is to flatten your veneer and two ply it. I know this is extrawork but as I said mahogany crotch is an ornery veneer and you will want all theinsurance you can get. Not to mention its a fairly large raised panel.SincerelyDarryl Keil: I'm planning to build a headboard in a few weeks with crotch mahogany : on the flat surface of a large (~18"x66") raised panel. I think I'm : getting both informed and confused on this forum, as I've found both : great info and some stuff that I was sure how to interpret.: It appears that many people are big fans of using Unibond 800, and : that's what I was going to order. But then I saw a posting from : Darryl that said, "once you have flattened the veneer with the : solution you definately want to use urea as the glue to press with : (powdered or liquid type). Does this mean that urea is what you want : to use whenever you have to flatten a veneer?: Also, I just received my veneer (from Flamingo) a month ago. It is : ripply to some degree; I'm wondering how flat I'm supposed to get the : veneer before working with it. Is it possible to get it totally flat : with the solution/techniques I see on this forum?: Based on advice from a guy at a local woodworking shop, I was going : to use an MDF panel edge-banded with pieces of mahogany just wide : enough to allow me to raise the panel edges after veneering. From : other sources it sounds like I should press the crotch mahogany to : some backing veneer (I was thinking the 1/16" or 1/32" poplar from : Constanine's) before I apply the sandwich to the MDF w/mahogany edge : panel. Does this sound right?: I haven't done any veneering before, and it currently appears what : I'll be working with is a good vacuum pump from a fiberglas boat hull : builder friend, who uses it with some kind of thinner 6 mil : polyethylene or Visqueen type throwaway sheeting, duct-taped at the : edges. I'm pretty decent at mechanical/crafty stuff, and can usually : manage to recover fairly well from small to medium mistakes, but I'm : intimidated after reading about some of the problems I might : encounter. Can you help me on the glue choice, and tell me whether : my plan sounds reasonable or needs to be revised?: As others have said, thanks so much for the forum.
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Look at the description and think about it. I found it a good investment at $35.Respectfully,Larry: I'm planning to build a headboard in a few weeks with crotch mahogany : on the flat surface of a large (~18"x66") raised panel. I think I'm : getting both informed and confused on this forum, as I've found both : great info and some stuff that I was sure how to interpret.: It appears that many people are big fans of using Unibond 800, and : that's what I was going to order. But then I saw a posting from : Darryl that said, "once you have flattened the veneer with the : solution you definately want to use urea as the glue to press with : (powdered or liquid type). Does this mean that urea is what you want : to use whenever you have to flatten a veneer?: Also, I just received my veneer (from Flamingo) a month ago. It is : ripply to some degree; I'm wondering how flat I'm supposed to get the : veneer before working with it. Is it possible to get it totally flat : with the solution/techniques I see on this forum?: Based on advice from a guy at a local woodworking shop, I was going : to use an MDF panel edge-banded with pieces of mahogany just wide : enough to allow me to raise the panel edges after veneering. From : other sources it sounds like I should press the crotch mahogany to : some backing veneer (I was thinking the 1/16" or 1/32" poplar from : Constanine's) before I apply the sandwich to the MDF w/mahogany edge : panel. Does this sound right?: I haven't done any veneering before, and it currently appears what : I'll be working with is a good vacuum pump from a fiberglas boat hull : builder friend, who uses it with some kind of thinner 6 mil : polyethylene or Visqueen type throwaway sheeting, duct-taped at the : edges. I'm pretty decent at mechanical/crafty stuff, and can usually : manage to recover fairly well from small to medium mistakes, but I'm : intimidated after reading about some of the problems I might : encounter. Can you help me on the glue choice, and tell me whether : my plan sounds reasonable or needs to be revised?: As others have said, thanks so much for the forum.