@darlander posted:I have been working on tunnel walls this past week. Using a kitchen knife, I split a one inch piece of styrofoam. As I work the knife around and through the panel, I cut and twist the blade causing the styrofoam to fracture and break apart.
The results produces two 1/2" panels that resemble a rough rocky structure. The panels are then painted a dark earthy color. Spray with "wet" water (add drop or two of soap) helps to bleed paint into cracks and crevices.
The panels are easily bent to follow the curve of the track in the tunnel area.
Note the pink styrofoam blocks in the last picture. They are glued in place the day before I set the wall panels. After a day to cure, a dab of adhesive is added to the face of the blocks and the panels wall is pushed into place. I use push pins and small c-clamps to hold them in place during cure. I'm using Loctite PL 200 construction adhesive purchased from Menards. It's cheap, provides a good strong bond and is compatible with styrofoam.
Morning Dave I got a link to this post from another post and looked and realized I have been hanging around this place since 2012! The best part is I am still learning!
