Veneering with Crotch Mahogany
After sanding you should glue size before finishing. In addition you need to watch the MC of the core and veneer prior to and after pressing. That usually will keep checking from happening, although sometimes it doesn't. As far as I know, there is not a permanent solution to fixing the panels you have except maybe an epoxy type finish. Most stock plywood houses do not follow the above so what you are getting is to be expected. Check with your supplier and see if they did any of the above. I'm not sure you would have any recourse.
From contributor O:
I am sure Contributor Cís method of using crossbanding when lying is correct, however if it is of any use in discussing the flaw with your client I would. Note that if you look at the great ďAge of MahoganyĒ masterpieces the wonderful carved cabinets with the beautiful panels of crotch mahogany are for the most part cracked and fissured. In antiques it is accepted as part of the charm of crotch mahogany.
From contributor C:
On the Tego film glue you need to hot press it at 275 degrees F and use at least 100 psi. It is important to go in the press with the veneer at high moisture content (some spray water just before pressing) as the high temp and long press time (five minutes) will turn your lovely veneer into a potato chip. Anyway, this takes a very strong press to get that much pressure and heat. A vacuum press is 15 psi at best.
From contributor A:
We use an Axlo Nobel pre-cat finish. Our piano mfg. customer uses a polyester finish and has no problems with checking. No matter what you do, if it is not cross banded, the core and veneer movement (dis-similar) will create checking again. If it's minor and you want to try, strip the old finish, re-sand, glue-size the veneer, sand very lightly, and re-finish. The epoxy would be any clear two part finishing epoxy. The problem is that it looks like epoxy unless you put it on light and then lacquer over it. You can get a finishing epoxy from U.S.Composites. Try it on a sample, it may eliminate your checking. We have had similar issues even with following the rules, but it's rare. Crotch cut wood is very hard and if it moves it cracks.
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