A dumb painting question

I have always worked with Floquil Dio-Sol based paints as I work mostly with wood. Now, with my lungs aging and a wife with asthma, I need to switch to acrylics. I do most of my finishing before I assemble the structures so… here is the dumb part…

How do I paint both sides at the same time to prevent the wood from warping?

Thanks for listening,

test