Someone told me this hardboard swells up bad when a little moisture hits it. What about using this instead since it says it is moisture resistant?

Thrifty White Tileboard 4ft. X 8 ft. - 346428 at The Home Depot

I was wanting to stay away from pre-painted building materials as I want to be sure no toxic gases will come off it when heated up with lights.
UpInVapor Reviewed by UpInVapor on . Tempered Hardboard for Walls Ok, So I am setting up a grow box. I was going to use plywood, but have heard from others how heavy that makes the box, so I went to Lowe's last night and found this: http://www.lowes.com/pd_7060-46498-SSP2202450_0_?productId=3043230&Ntt=tempered%20hardboard&Ntk=i_products_cascade&pl=1&currentURL=/pl__0__s?newSearch=true$Ntt=tempered%20hardboard$y=13$x=30 This is tempered hardboard that is 3/16 " thick and looks like it would be perfect for my setup seen below in this layout: I Rating: 5