Ethan Clarke
There are many ways to coat foam in plastic, and the best method depends on the type of foam and plastic used. Polyurethane coatings are strong, durable, and watertight when applied to various surfaces, including foam. Polyurea hybrid coatings are also an option and can be applied to foam, plastic, cardboard, wood, cement, and metal. These coatings are designed to protect against impacts, wind, moisture, and sunlight. They can be sprayed or brushed onto the foam and can be smoothed with a metal trowel or putty knife.
| Characteristics | Values |
|---|---|
| Materials | Polystyrene or Styrofoam, paint thinner, solvent, polyurethane, polyurea, epoxy, resin, fiberglass, acrylic, polyester resin |
| Tools | Jar, brush, hopper gun, airless sprayer, trowel, putty knife, sandpaper, flap discs, sponge |
| Techniques | Dissolving polystyrene/Styrofoam in solvent, mixing with paint thinner, dipping, brushing, spraying, sanding, smoothing |
| Considerations | Clear vs. coloured coating, drying time, safety, cost, durability, protection, finish |
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What You'll Learn
Using a hopper gun to apply plastic coating
When using a hopper gun to apply plastic coating, there are several important factors to consider. Firstly, hopper guns are typically used for applying textured finishes and external render, and may not be suitable for smooth finishes. While they can be used to spray finishing plaster, this can be challenging due to the thickness and weight of the plaster, which can clog the gun. Therefore, it is important to choose the appropriate hopper gun for the specific finish you are trying to achieve.
Another important consideration is the weight of the hopper gun, especially for larger jobs that require the gun to be held above the shoulders for extended periods. Metal hopper guns tend to be heavier and can contribute to operator fatigue. Newer, lightweight gravity-fed hopper guns made from reinforced composite materials are available, offering improved performance and reduced weight. Pressurized hopper guns are another option, as they use uniform, pressurized air to project the material farther and facilitate spraying on high, hard-to-reach surfaces.
When using a hopper gun, it is crucial to prioritize safety. When the coating becomes an aerosol, it can be inhaled or come into contact with the eyes and skin. Therefore, protective clothing and respirators are necessary safety precautions. Additionally, thinning the coating may be required for hopper guns, as some materials are too thick to spray effectively. Experimenting with different nozzles and thinning mixtures can help achieve the desired coverage and finish.
For small to medium interior construction projects, the choice of air compressor and texture hopper gun is critical. The right equipment can help deliver consistent texture finishes and improve work efficiency. It is recommended to select a hopper gun that aligns with the specific job requirements while offering long-term benefits, such as improved performance and reduced cleanup issues.
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Polyurea hybrid coatings
The choice between pure polyurea and hybrid polyurea coatings depends on the specific use case. Pure polyurea coatings are typically low-odor, zero Volatile Organic Compound (VOC) products, making them suitable for environmentally sensitive applications. They offer good chemical resistance to hydrocarbons, hydrogen sulfide gas, and immersed sewage applications. On the other hand, hybrid polyurea coatings are more similar to polyurethane and usually have a more complex resin mixture. They may have a mild odor and may be low-VOC rather than zero-VOC. While hybrid polyureas can be modified for specific purposes, they are not recommended for direct food contact or potable water storage.
Hybrid polyurea coatings are available in various formulations, such as roll-applied, castable, cartridge-based, and aliphatic systems. Aliphatic polyurea is ideal for one-coat applications where UV color stability and gloss retention are necessary. They can also be formulated to meet specific requirements, such as fire-rated coatings for power poles, armored tanks, and dog kennels.
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Polyurethane coatings
To apply polyurethane coatings, you can use a hopper gun, but protective clothing and respirators are necessary as the coating becomes an aerosol and can be inhaled or come into contact with the skin. You can also thin the coating with denatured alcohol or mineral spirits to use it with an airless sprayer.
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Epoxy coatings
Unlike polyurea coatings, epoxy coatings are usually brushed or rolled onto the foam surface, making the application process more labor-intensive. Epoxy coatings are also applied in thinner coats, which makes them more fragile than other coatings.
There are various epoxy coating products available, such as the Polygem Aquagem Epoxy Plastic Foam Coating, which comes in different kit sizes, and the Foam Shield II - Foam Coating.
When applying epoxy coatings, it's important to consider the material and texture of the foam, the desired finish, and any specific project requirements, such as budget and timeline constraints.
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Smoothing techniques
When coating foam in plastic, there are several techniques you can use to smooth the surface. The smoothing method you choose will depend on the shape of the structure, the desired finish, your budget, and the time you have available.
One option is to use a hopper gun to spray on the coating. This method is suitable for large areas and can be used with some coatings, such as All Purpose and Exterior Foam Coat. However, it requires protective clothing and respirators due to the aerosolized particles. Additionally, the coating must be thinned for spraying, and the sprayer needs to be cleaned thoroughly after use to prevent clogging.
Another approach is to brush or roll on the coating. Epoxy coatings, for instance, are typically applied in this manner. While this technique can be more labor-intensive, it allows for better control over the application process. To smooth brush strokes and other imperfections, lightly tap on the foam during the coating process. This will cause the coating to momentarily liquefy, resulting in a smoother finish.
For powdered coatings, a damp sponge can be used for initial smoothing. You can also use a metal trowel or putty knife to smooth the coating while it is still setting. Flexible rubber or plastic can help create smooth curves. If you want to smooth out the coating further after it has dried, you will need concrete-grade sanding tools, such as flap discs for concrete.
The type of coating you choose will also impact the smoothness of the finish. For example, Styroplast is known for being a very smooth plastic coating, while Create Coat is also smooth but may require the addition of Boost for better adhesion if you plan to layer it. Epoxy coatings tend to have a relatively smooth finish and can be sanded for a smoother texture. On the other hand, coatings like fiberglass, while strong and durable, can be messy and labor-intensive, requiring multiple layers of mats and resin.
Ultimately, the smoothing technique you select will depend on the specific coating you are using and the desired outcome for your project.
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Frequently asked questions
Polyurethane coatings are strong, durable, and watertight when applied to various surfaces. They can be applied directly to foam and will not melt it. Polyurea hybrid coatings are another option, made of both polyurea and polyurethane, and are strong yet maintain flexibility when applied to foam surfaces.
The process depends on the type of coating being used. For example, epoxy coatings are brushed or rolled onto the surface, whereas polyurea hybrid coatings must be sprayed through plural component spray equipment.
You can smooth foam coat with a metal trowel or putty knife while it is setting. Smooth curves using a piece of flexible rubber or plastic. You can also use a lightly dampened sponge for initial smoothing.
Styrofoam is a brand name for closed-cell extruded polystyrene (XPS) foam. Polyurea, urethane, or hybrid coatings are the best options for protection. You can also use a combination of polyurethane foam and fiberglass.
You can make your own plastic coating by mixing polystyrene or Styrofoam with a solvent. You can also add paint thinner and mix with paint to make an indestructible chip guard paint.
