Shahid, even 19mm MDF warps on a warped surface so you have to put the board on your wobbly table, and then very carefully sight along and across it (and check end to end) and pack it up with scrap balsa or whatever.I also used a large straight edge across it. I think virtually anything is gonna warp if its put onto something thats not 100% flat. Dont worry about it too much, just be very careful & accurate when you pack it up.


Jim