George, those are good suggestions from kd. I, too, learned to use cheap spray primer (virtually any brand works) from Art. While I do have a hair dryer in the shop, I generally just spray both sides of a basswood wall and when it's dry to the touch, weight it down (heavy books work well) for an hour or so. putting wax paper under and over the walls will minimize paint transfer. this is basically Art's method before using acrylics and you'll always get straight walls. if there's still any curvature you can always add a few pieces of stick bracing on the back.
jerrman
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