One thing i forgot to mention.. its possible to warp the boards from too much heat i found out the hard way when i did the last two

Dont worry though if anyone tries this method though of making boards... if the board warps they can be reheated with the iron after they are etched (place a sheet of paper  between the iron and the board) and use the clothes iron to heat it up again, then just hold it flat with a few books etc til it cools