How to Glue Polystyrene: A Step-by-Step Guide

How to Glue Polystyrene: A Step-by-Step Guide

Polystyrene, also known as foam board or expanded polystyrene (EPS), is a lightweight and versatile material used in insulation, crafts, and construction. Properly gluing polystyrene requires selecting the right adhesive and following the correct steps to ensure a strong and lasting bond. This guide will help you achieve the best results.

Materials Needed:

  • Polystyrene sheets or blocks

  • Suitable adhesive (foam-safe glue, spray adhesive, or solvent-free construction adhesive)

  • Utility knife or hot wire cutter

  • Sandpaper (optional)

  • Clean cloth

  • Protective gloves

  • Weights or clamps (if necessary)

Step 1: Choose the Right Adhesive

Not all glues are compatible with polystyrene. Some adhesives contain solvents that can dissolve or weaken the foam. The best choices include:

  • Foam-safe spray adhesive – Evenly coats surfaces and provides good adhesion.

  • Solvent-free construction adhesive – Ideal for larger projects, offering a strong bond.

  • Special polystyrene glue – Designed specifically for this material.

  • Hot glue (low temperature) – Works for quick applications but may melt the foam if too hot.

Step 2: Prepare the Surfaces

  1. Ensure the polystyrene surfaces are clean, dry, and free from dust or grease.

  2. If necessary, use sandpaper to slightly roughen the surfaces for better adhesion.

  3. Wipe the surfaces with a clean cloth to remove any debris.

Step 3: Apply the Adhesive

  1. Apply a thin, even layer of glue to one or both surfaces, depending on the adhesive type.

  2. Avoid using too much glue, as it may weaken the bond or take longer to dry.

  3. Follow the adhesive manufacturer’s instructions for setting time and application.

Step 4: Press the Pieces Together

  1. Carefully align the polystyrene pieces before pressing them together.

  2. Apply firm but gentle pressure to ensure full contact.

  3. Use weights or clamps to hold the pieces in place if necessary.

Step 5: Allow for Proper Curing

  1. Let the adhesive cure as recommended by the manufacturer. This can take anywhere from a few minutes to several hours.

  2. Avoid moving or stressing the glued pieces during this time.

Tips for Best Results:

  • Always test the adhesive on a small scrap of polystyrene before applying it to your main project.

  • Work in a well-ventilated area, especially when using spray adhesives.

  • Store leftover polystyrene in a dry, clean space to prevent contamination.