I have a couple of pieces of timberboard (the stuff made from strips glued together) one 400mm wide one 300mm. To be used as a shelf along the top of some boxing in a bedroom.
It's been sitting around in the house quite happily for a few months and was still nice and flat. Today I stained it with a couple of coats of Colron wood dye and now it has bowed (or cupped?) quite noticeably - inwards on the stained side. doubly annoying as I was hoping to install it and paint the walls this weekend
This doesn't seem to be something to be expected - but any comments before I complain about it