I'm new to woodworking. I acclimitised my wood to my workshop environment for a week, then planed and sanded my wood. At this point it was flat. A few weeks later it is slightly warped. It went from being perfectly flat on a table to not being flat.
Is there something I can finish planed & sanded wood with that would stop it warping? I'm assuming I need to moisture lock the board essentially to stop the warping.
I'm keen for the wood to look and feel as natural as possible !