How to Set Up a 2.40x1.20m Poly Plaque for Set Walls

Quick answer

To set up a 2.40x1.20m poly plaque as a set wall, you need a solid frame, proper cutting tools, and careful handling to avoid damage. The Matphoto poly plaque (5 cm thick) is lightweight but requires support to stay upright on set.

Step-by-step setup

1. Prepare your frame: Build a wooden or aluminum frame that matches the 2.40x1.20m dimensions. Use 2x4 lumber or square tubing to create a rectangle. Attach a plywood or MDF backer board to the frame for extra support. This prevents the poly plaque from bowing or cracking. Common mistake: skipping the backer board. Without it, the soft plaque can sag or break when leaned against a support.
2. Cut the plaque to size: Use a sharp utility knife or a hot wire cutter to trim the poly plaque. Score the line several times, then snap the board over a straight edge. For the 5 cm thickness, you may need to cut from both sides. Wear a dust mask and work in a ventilated area. Checkpoint: measure twice before cutting. A crooked cut will leave gaps in your set wall.
3. Attach the plaque to the frame: Apply construction adhesive to the backer board, then press the poly plaque onto it. Use low-tack tape or clamps to hold it in place while the adhesive dries. Avoid screws or nails—they can crack the polystyrene. Common mistake: using solvent-based adhesives. They can melt the polystyrene. Stick to water-based or low-VOC construction adhesive.
4. Finish the surface: Sand any rough edges with fine-grit sandpaper. Prime the plaque with a water-based primer before painting. Apply thin coats of latex paint to avoid soaking the material. For a seamless wall, fill joints between plaques with spackle and sand smooth. Checkpoint: test paint on a scrap piece first. Some paints can cause the foam to dissolve or bubble.
5. Position and secure on set: Stand the framed plaque upright and brace it with sandbags or stage weights. Use C-clamps or ratchet straps to attach it to a solid structure if needed. Never lean the bare plaque against a wall—it can topple or dent. Common mistake: not securing the base. A lightweight poly wall can tip over with a light bump. Always add ballast.

Product facts

• PLAQUE POLY 2,40 X 1,20M- EPAISSEUR 5CM: The Matphoto poly plaque measures 2.40 x 1.20 m with a thickness of 5 cm and is listed as a consumable item. The 5 cm thickness provides enough body for a stable set wall, but being a consumable means it is designed for single or limited use, so plan to replace it after a few productions.