Why are my boards warping?
I have cedar picket fence boards purchased from Menards that were planed and nailed together to make a DIY sign to paint on. They are warping now that they are put together. I made another and tried painting to seal it immediately and same thing. Wood was not wet and set in the house several days after I'd bought it, then in the garage for a month. What am I doing wrong? Is it just because it's cedar? Or the wood is too thin? or?