Sofia Martinez
Plastic cement is a gel-like adhesive commonly used in plastic model building and rocketry. It is inexpensive and readily available in hobby, craft, and hardware stores. However, it can be messy and stringy to work with, and it tends to yellow and lose its adhesion over time. For these reasons, modellers sometimes seek alternative adhesives. Substitutes for plastic cement include two-part epoxy, cyanoacrylate (CA), Super Glue, hot glue guns, Gorilla Clear Contact Adhesive, Starbond, and plastic solvent glues. Interestingly, researchers are also exploring the use of plastic as a replacement for cement in construction, which could reduce emissions and strengthen concrete.
| Characteristics | Values |
|---|---|
| Substitute for plastic cement in model building | Two-part epoxy, Super Glue, Cyanoacrylate (CA), Liquid Solvents, Hot Glue Guns, Gorilla Clear Contact Adhesive, Starbond, Loctite Vinyl Fab Plastic Adhesive |
| Substitute for plastic cement in concrete | Finely ground plastic from old plastic bottles |
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What You'll Learn
Two-part epoxy
Epoxy adhesives come in different formulas, such as rigid, flexible, and toughened varieties, to meet specific needs. Flexible epoxies have lower tensile strength but higher elongations, making them capable of withstanding differential movement of bonded parts. They also have higher peel strength and better adhesion to most engineered plastics. Toughened epoxies, on the other hand, have higher tensile strength and lower elongations, making them ideal for fatigue resistance and dynamic stresses. They offer long-term holding power and exceptional resistance to shock, vibration, and impact loads.
When using a two-part epoxy, it is important to follow the manufacturer's instructions. Typically, you would apply the desired amount of epoxy to both surfaces, press them together, and then clamp them in place for 1-3 hours until the epoxy sets. The exact cure time may vary, and heat can speed up the process while cold will slow it down.
Two-part epoxies are suitable for bonding a wide range of plastics. For example, they are recommended for bonding ABS plastics, PVC, acrylic, polycarbonate, and FRP. Additionally, epoxies are often used for clear, brittle plastics like imitation glass or CD cases, which are typically made of polystyrene. They can also be used for solvent-based bonding or when an epoxy-based adhesive is required. Specific products like 3M Scotch-Weld Epoxy Adhesive DP420NS are designed for applications facing tough environmental challenges, while 3M Scotch-Weld Epoxy Adhesive 2216 is meant for high-performance and flexible bonds.
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Cyanoacrylate (CA) glue
CA glue is a versatile adhesive that can be used to bond anything from metal to plastic and even human skin. It is particularly useful for plastic model building and model railroading, where it can be used as an alternative to plastic cement. When using CA glue, it is important to note that it works differently from traditional adhesives. Unlike water-based glues, CA glue needs water to cure. This water can come from moisture on the surface of the material being bonded or from the humidity in the air.
One of the main issues with CA glue is the possible lack of bonding between the glue and a surface when there is insufficient moisture. This can be addressed by applying a thin layer of water to the surface before gluing. However, this method may not work on all materials, such as heat-resistant plastics, which tend to repel moisture. In such cases, an epoxy adhesive may be a better choice.
Another consideration when using CA glue is its tendency to form strong bonds with undesirable surfaces, such as human skin. This is because the human skin is typically covered in a thin layer of moisture, providing ideal conditions for the glue to cure. To prevent accidental bonding, it is recommended to wear gloves when working with CA glue. Additionally, goggles may be necessary to avoid eye irritation from the glue's fumes.
CA glue should be applied sparingly to one side of the surface being bonded. Applying it to both sides may result in a weaker bond. The glue works best when applied in a thin layer, as a heavy application can produce a weaker bond. Commercially available applicators are designed to work with the glue's viscosity properties, and extra-thin CA glue has lower viscosity and surface tension than water, allowing for precise application.
CA glue is a popular choice for modelling and repair work due to its strong adhesive properties and ease of use. However, it is important to carefully follow the instructions and take the necessary precautions to ensure successful and safe usage.
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Hot glue guns
While hot glue guns are not mentioned as a substitute for plastic cement, there are a variety of alternatives available. The best alternative depends on the type of plastic being used and the nature of the project.
For instance, for standard Estes rockets, wood glue is used for attaching balsa fins, engine mounts, etc. For the paper-to-plastic interface, wood glue can be used, but it is not ideal as it cannot soak into the plastic. Plastic cement is also used for plastic parts, which can be purchased at most hobby, craft, and hardware stores.
For plastic model kit building, alternatives to plastic cement include CA glue, MEK, and plastic solvent glues. A thin layer of cement can be topped with a tube of thick cement for heavy, long-curing joints. Super glue is also an option, but it is not suitable for every situation.
For bonding polystyrene, a poly cement, epoxy, or cyanoacrylate will form a sufficient bond. For polycarbonate, an epoxy is best, while an acrylic solvent adhesive is needed for acrylic. For ABS plastics, an ABS solvent adhesive can be used, but it will warp the plastic. An epoxy or cyanoacrylate glue is a better option.
Other alternatives to hot glue guns include double-sided tape, spray glue, fabric glue, and plastic glue.
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Gorilla Clear Contact Adhesive
Plastic cement is a gel-like substance that contains a chemical, such as Toluene, that forms a membrane that bonds two surfaces together when applied to the joining surfaces of a plastic model. Some alternatives to plastic cement include two-part epoxy, cyanoacrylate (CA), and Super Glue.
The adhesive is also waterproof, paintable, and can be used for both indoor and outdoor projects. When using Gorilla Clear Grip, it is important to wear safety glasses and chemical-resistant gloves to protect yourself from the flammable adhesive. It should be stored in a cool, dry location, away from heat, sparks, flames, or smoking materials.
Gorilla Clear Grip has been praised by users for its stability and longer working time compared to other adhesives. It has a tacky glue-like consistency, providing a strong hold while allowing for repositioning of the pieces being adhered. The tube also keeps the adhesive fresh for longer, preventing the issues of drying and cracking that can occur with other adhesives.
Overall, Gorilla Clear Contact Adhesive is a versatile and effective alternative to plastic cement, offering strong bonding capabilities and ease of use for a range of projects and surfaces.
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Loctite Vinyl Fabric Adhesive
One of the key advantages of Loctite Vinyl Fabric Adhesive is its ability to dry clear and transparent, leaving invisible repairs. It resists yellowing or brittleness with age or exposure to sunlight, ensuring that your repairs remain discreet and aesthetically pleasing. This feature is especially useful when repairing items that are frequently exposed to sunlight, such as outdoor furniture or pool toys.
The adhesive is also known for its fast-setting and curing properties. It sets in just 10 minutes and cures fully within 24 hours, providing a quick and efficient solution for repairing damaged items. Additionally, it is waterproof, making it suitable for repairing items that come into contact with water, such as raincoats, wading pools, and beach balls.
Overall, Loctite Vinyl Fabric Adhesive is a reliable and versatile adhesive that offers a flexible, waterproof, and discreet solution for repairing a wide range of items. It is a convenient and user-friendly option for anyone looking to quickly and effectively mend tears, holes, or seams in vinyl, fabric, or plastic materials.
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Frequently asked questions
Some alternatives to plastic cement are epoxy, cyanoacrylate (CA), super glue, hot glue guns, Gorilla Clear Contact Adhesive, Starbond, and Titebond.
Two-part epoxy is a stronger substitute for plastic cement.
Cyanoacrylate (CA) and super glue are fast-curing substitutes for plastic cement.
CA glue is great for small joints.
Thick cement is fantastic for big, heavy, long-curing joints.
