Hi everyone. Thanks for the amazing resource of this community. I am beginning to make some wood art with a 100 watt laser that will be either around 10" or 24" square. I am concerned that if I use 1/4" Baltic birch, it may warp after some time if the clients home. Does anyone have knowledge of what size plywood warping becomes an issue? I could use MDF but it cuts slower and would need a good veneer. Also, if the Birch is painted at this size, is it standard practice to still paint the back to keep the wood even? Thanks!