It is so difficult to work with veneer that has reshaped itself into a topographical map, this should help.


[B]Recipe and Ingredients for a veneer flattening mixture:[/B]
[B] [/B]
Mix together the following:
2 (two) measures of Cascomite (powdered urea formaldehyde)
1 (one) “ “ Flour (regular)
3 (three) “ “ Water
1.5 (one & a half) “ Glycerin
1 (one) “ “ Denatured alcohol

Method:
Rub mixture on to veneer with natural bristle brush,
leave for 5 minutes and lightly rub off any surplus mixture/moisture.

Place treated veneer between two sheets of waxed paper and place in a press for a few hours.

I them store the flattened veneer in fresh waxed paper inside a large book.
Tried and true.
My favorite veneer source for large scale models:
H9764 Sequenced Matched Walnut Burl Veneer, 3 sq. ft.


Tage - Journeyman cabinetmaker.