A dumb painting question

[Blind Bruce]

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, 

[dehusman]

test