Need some advice. We have ripped out walls but have left the styrofoam in. Should we replace styrofoam that is black and wet? Or just let it dry out.?Is there a spray that kills mold. So far I have used Minwax Early American stain on both sides of the 1/8 underlay. The stain is oil base. It stains seals and protects. Next I was going to spray on Thompsons water seal to both sides of the underlay. Hubby raised a question about weather the liquid nails would stick onto the Thompsons properly for the new 1/8 Georgia pacific paneling. Not all the styrofoam is wet. My daughter promised she would post pictures tomorrow. We figured out how to take the big cupboard out above the dinette. I ended up ripping out quite a bit of the old wallpaper as it had lost the majority of the glue and was 21 yrs. old and brittle. I appreciate any and all advice from others that have done restoration.