I'm not sure what I did wrong. I'm building a small AV cabinet. I cut all the pieces of wood and did all the detail work (pocket holes, shelf holes, etc) first. I also let my pine wood rest before doing anything to make sure it didn't warp.
I pre-stained, stained, and applied clear gloss to one side (after waiting the proper amount of team between each).
I then flipped all my pieces over, pre-stained, stained, and applied clear gloss to the other side of all the pieces.
Now when I look at the pieces they are warped. All of them. I'm not sure what I did wrong here. Should I have assembled them together first? Before staining?