How to glue Styrofoam together: A DIYers manual

Get smart, then start. This guide will show you how to glue Styrofoam together. It’s a must read for anyone who likes to do craft projects or is working on home improvement jobs using polystyrene foam.

Styrofoam and polystyrene are common types of foam used in insulation, cushions, decorations, and more. If you are working with this material, you may need to know how to glue Styrofoam together or to other materials. We can help!

The most used adhesives to glue Styrofoam are:

• Styrofoam adhesive 
• super glue
• spray adhesive

Each has its advantages, so let’s cover some details to help you decide which is right for your job.

If you have foam insulation boards to install, try LePage PL 300 Foam Board Adhesive. It’s the perfect choice because it bonds firmly to all common construction materials and is resistant to moisture and weather on the construction site. It bonds quickly and firmly to minimize the need for fasteners.

For quick and easy polystyrene repairs, you’ll love LePage Super Glue Gel Control. The special rubber-infused formula creates a powerful bond, and it is resistant to moisture and freezing temperatures. It dries clear and is suitable for outdoor use as well.

Looking for an excellent quality spray-on for your upholstery work? LePage Heavy Duty Spray Adhesive is the answer. If forms a strong bond and won’t yellow over time. Apply multiple coats for a super-strong bond.

Let’s briefly cover how to glue Styrofoam with each of the above adhesives.

Foam board insulation is widely used because it is lightweight, and it’s also excellent at holding in heat. It’s also very easy to cut and install, and many people prefer it to batt insulation. The best adhesive for this type of application is construction adhesive designed for foam boards. Here are some installation tips: 

1. Measure and cut the foam board to fit. (Test fit each piece before applying glue.) Ensure your work area is clean and free from dust and debris.
2. Apply lines of adhesive to the back of the board about 25cm (10 inches) apart and around the edges. Don’t apply adhesive right at the edges. Leave a 5cm (2-inch) margin.
3. Press the board into place and secure with a few nails or screws.
4. If desired, you can apply a spray foam around the edges of the board where it meets adjoining framing. This will completely seal any gaps.

Some types of super glue work very well for lighter-duty projects, such as crafts, decorations, and displays.  Super glue is quick and easy to use and will bond to Styrofoam quite strongly. Depending on the application, you may want to use a flexible adhesive that will stand up to vibration, shock, and impact without tearing or damaging the foam.

Here are the simple directions:

1. Pre-fit the parts. Make sure your parts fit together correctly before applying any adhesive.
2. Place a small amount of glue (usually just a drop or two), on one of the surfaces.
3. Press together and hold until a bond forms. Most super glues bond in under a minute.
4. Allow the item to fully cure overnight before normal use.

If you have larger flat areas to glue, such as covering a seat cushion or a display board, spray-on adhesive may be a good option. You can apply the glue to large areas very quickly, and spray-ons will not generally bleed through thin materials or fabric. Here’s how to do it:

1. Set up a work area and cover items that might get overspray with a drop cloth or plastic.
2. Lay the items to be bonded out flat.
3. Shake the can of adhesive a dozen times or so.
4. Spray an even coat on each surface. Hold the can vertically about 25cm (10 inches) from the surface.
5. Allow the glue to become tacky before joining the items.
6. Place the items together and smooth out any wrinkles or air pockets.
7. Put some weight on top of the bonded surfaces to keep them together until dry if needed.

All the products mentioned above are powerful adhesives. Avoid getting them on your skin. Wear safety glasses and nitrile gloves. Also, work in a well-ventilated area to disperse any fumes.