How to Texture Foam
How to transform XPS foam into wooden boards, old mossy weatherworn stone bricks, and rough rock.
Supplies
XPS foam
A stiff wire brush
Pliers
A dull tipped pencil
A rough rock
Acrylic paints
Step 1: Wood: Grains

First, using a dull pencil or something like that, draw horizontal lines across the piece of foam that you're working with, pressing into the foam to make a teeny trench. Next do the same vertically, staggering it so it looks like long, spaced out bricks as shown in the pictures above. Using the wire brush you can then scrape the wood grains horizontally along the foam. Press lightly at first, making thin, soft grains, then press harder for a few deeper grains. Finally using the dull pencil again make a few slightly curvy lines along the board. You can also add a few knots and swirls into it as well, all the while following the grain. Read More...