Can't get a screw into MDF
Maybe this is a stupid question, but I'm stuck. I'm trying to attach MDF boards to closet walls to support shelving. I'm using #8 2" screws. I've drilled a 3/32" pilot hole all the way through the MDF. The screw seems to go through the board just fine, but as soon as it hits the wall, it just won't go in. Just to test the wall, I tried putting a screw into just the wall without a board, and it went in just fine. What am I doing wrong? Should I just use nails?