I was recently hunting for 1/4 MDF, and what I found at Home Depot wasn't in the lumber/sheet material section, but rather near the finished shelving material. I suspect it's intended to be used as the back of a shelving unit. One side is covered with white vinyl. The sheet was 49" x 97" (an inch larger than 4'x8'), for about $15. As far as I can tell, it -is- MDF.
The vinyl stuff pulls right off easy enough, leaving a surface that is rougher, not quite like the smooth surface you normally find on MDF, but I just used that surface as the inside of my x-axis box. Seemed to work fine, and that surface probably took the glue better.
Gary |