Omar Khalid
When it comes to plastic models, the right adhesive and precision tools can elevate your craftsmanship. Different types of plastics require different types of adhesives, and knowing what type of plastic you are working with will enable you to choose the appropriate glue. For instance, polycarbonate plastics work best with epoxy, while acrylic plastics require an acrylic solvent adhesive. Super glue is a popular choice for small repairs and bonding unlike materials, but it may not work for all plastics. For intricate projects, the Xuron® Model 860 Dispensing Bottle provides precise and controlled glue application, reducing waste and ensuring accuracy.
| Characteristics | Values |
|---|---|
| Types of adhesives | Super glue, plastic bonder, epoxy, cyanoacrylate (CA) glue, solvent-based bonding, tube glue, model cement, liquid styrene cement, liquid cement, welding solvent, all-purpose glue, hot glue |
| Types of plastics | Polycarbonate, acrylic, ABS, polystyrene, styrene, chromed plastics, expanded polystyrene foam |
| Considerations | Type of plastic, liquidity, heat properties, curing time, strength of bond, precision, messiness, yellowing over time, weakness, safety, ease of use, cost |
| Tools | Xuron Model 860 Dispensing Bottle, glue gun, super glue applicator, super glue activator |
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What You'll Learn
Choosing the right adhesive
Type of Plastic
Firstly, identify the type of plastic you are working with. Different plastics require different adhesives. For example, Low Surface Energy (LSE) plastics are more difficult to bond and may require specialist products or surface preparation methods. Knowing the specific type of plastic will help you choose the right glue.
Project Requirements
Consider the requirements of your project. Do you need a fast-curing adhesive like super glue, or do you require a stronger bond that can be achieved with a welding solvent? Think about the liquidity and heat properties you need, as well as any potential drawbacks like messiness, yellowing over time, or weakness.
Application Precision
The precision of glue application is crucial in plastic modelling. Consider using precision tools like dispensing bottles with fine needle-like nozzles, which allow for exact glue placement. This is especially important for intricate projects where accuracy is key.
Time Constraints
Determine how much time you have to work with the adhesive. Consider the "open time," the time you have to put everything in place, and the "cure time," the time needed for the adhesive to set before use. Choosing an adhesive that suits your time constraints is essential.
Cost Considerations
While cost is an important factor, don't compromise on quality. Choosing the wrong adhesive can lead to costly corrections. Research and select an adhesive that meets your specific needs, ensuring long-term savings and a successful bonding experience.
By considering these factors, you can choose the right adhesive for your plastic model, ensuring a strong and precise bond that enhances the overall craftsmanship of your project.
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Preparing the plastic surface
Firstly, it is important to identify the type of plastic you are working with. Different types of plastics require different adhesives. Common types of plastics include polycarbonate, acrylic, and ABS. Knowing the specific type of plastic will help you choose the most suitable adhesive for your project.
Once you have identified the plastic type, the next step is to clean and prepare the surface. Use a mild soap or detergent and water solution to gently clean the plastic surface, removing any dust, grease, or oily residue. Ensure the surface is completely dry before proceeding. If the plastic surface is smooth or shiny, you can lightly sand it with fine-grit sandpaper to create a rougher surface for better adhesion. This process is known as "keying" or "abrading" the surface, which increases the surface area and improves the bond strength.
If you are working with plastic model kits, you may need to test the fit of the pieces before applying any adhesive. This ensures that the parts align correctly and any adjustments can be made beforehand. It is also important to consider the working time of the adhesive you choose. Some adhesives, like epoxy, have a limited working time once mixed, so it is essential to work efficiently and join the parts promptly.
When working with liquid solvents, always work in a well-ventilated area to avoid inhaling hazardous fumes. Solvents like MEK (butanone) should be avoided as they can dissolve the plastic instead of welding it. Instead, opt for liquid solvents specifically designed for scale modeling or plastic welding, such as ethyl acetate or butyl acetate. These solvents provide faster setting times and better welding properties without damaging the plastic.
By following these steps and choosing the appropriate adhesive for your plastic surface, you can achieve a strong and lasting bond for your plastic models. Remember to always read the manufacturer's instructions and take the necessary precautions to ensure a safe and successful adhesion process.
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Applying the adhesive
When applying adhesives to plastic models, there are several factors to consider. Firstly, it is important to determine the type of plastic you are working with, as different plastics require different types of adhesives. Polycarbonate, for instance, works best with epoxy, while acrylic requires an acrylic solvent adhesive. Knowing the type of plastic will enable you to choose the most suitable adhesive.
Once you have selected the appropriate adhesive, you can begin the application process. Before applying the adhesive, ensure that the plastic surfaces are clean and free of any dust or oily residue. If the surface is smooth or shiny, lightly sanding it with sandpaper can improve adhesion. It is also a good idea to pre-fit the parts to ensure they fit together properly before introducing the adhesive.
When you are ready to apply the adhesive, only apply a small amount to one surface. Hold the bottle or applicator at an angle and gently squeeze to dispense the required amount of liquid. Always use a pulling motion, pulling the adhesive towards you rather than pushing it away. This helps ensure precise and controlled application.
For intricate projects that require a high level of precision, consider using a dispensing bottle with a fine applicator needle, such as the Xuron® Model 860 Dispensing Bottle. This tool can hold up to 2 ounces of adhesive and comes with three applicator needle sizes: .010”, .020”, and .040”. The smaller needle is suitable for most liquid solvents used in scale modelling, while the larger needles are ideal for applying craft-type glues.
If you are working with liquid solvents, be aware that they dry quickly. If you make a mistake and place a drop in the wrong area, simply leave it to dry completely. You can then polish out any blemishes left behind. Avoid touching the adhesive with your finger or a towel, as this will leave an unwanted impression in the plastic.
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Using precision tools
Precision tools are essential when applying adhesives to plastic models, as they ensure that glue reaches the desired areas without creating a mess or leaving excess residue. There are several precision tools available for applying adhesives to plastic models, each with its advantages and specific use cases.
One popular option is the Xuron® Model 860 Dispensing Bottle, which comes with three different-sized applicator needles: .010", .020", and .040". The ".010" needle is suitable for most liquid solvents used in scale modelling, while the larger needles are ideal for applying craft-type glues such as wood glue. This tool allows for exact dispensing, reducing waste and ensuring accurate glue application.
Another option for precision application is the Glue Looper®, which is designed for use with CA (cyanoacrylate) adhesives. This applicator is easy to use and helps prevent mess and waste.
Precision bottles with needle-like nozzle applicators, such as the Humbrol Precision Poly and Revell Contacta Pro, are ideal for small parts in plastic models as they allow for very precise glue application. However, one drawback of these precision bottles is that the glue can dry in the needle and cause blockages.
For super glue, there are also precision applicator tips available that offer more precision than the standard nozzle. These metal tubes fit 20g bottles and, while they may clog quickly, they allow for more precise applications. Additionally, super glues like Gorilla Super Glue often come with precision applicator tips, allowing for controlled and precise application. These fine tips ensure that the glue reaches the desired areas without creating a mess.
For gap filling and repairing exterior siding, precision syringe applicators are available for certain glues, such as the J-B Weld glue for plastic. These precision syringes are also useful for applying glue in hard-to-reach areas.
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Drying and curing
Firstly, it is important to understand the distinction between drying and curing. Drying refers to the evaporation of solvents within the adhesive, resulting in a hardened adhesive layer. On the other hand, curing involves a chemical reaction that creates a cross-linked polymer network, providing the final bond strength.
When working with liquid solvents, such as those used in scale modelling, it is important to let them dry completely if you accidentally misplace a drop. You can then polish out any blemishes left behind. Avoid touching the wet solvent with your fingers or a towel, as it will set the texture into the plastic.
For fast-curing adhesives like Super Glue (cyanoacrylate), you can use an accelerator to instantly cure the adhesive. Some epoxies can also be cured quickly with UV light, which can be handy for quick fixes. If you need more working time, slow-curing Super Glue or epoxy can give you ample time to align pieces before permanent adhesion.
The Pratley Powda Bond adhesive is a unique option that combines a filling powder with cyanoacrylate glue. It can bond to various materials, including plastic, within one minute of all liquid being absorbed. Once cured, it can be sanded, filed, drilled, tapped, and painted without compromising its structural integrity.
For a strong, heat-resistant adhesive, J-B Weld waterproof glue is an excellent choice. It takes 4-6 hours to set, providing ample time for adjustments. However, clamping pieces in place is recommended once you achieve the perfect position. This adhesive has a tensile strength of 5,020 PSI and is suitable for use with plastic, metal, and other materials.
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Frequently asked questions
The most commonly used adhesives for gluing plastic together are super glue, plastic bonder, and epoxy. Other adhesives include cyanoacrylate (CA) glue, tube glue, model cement, and liquid solvents.
Different types of plastics require different types of adhesives. It is important to determine the type of plastic you are dealing with to choose the appropriate adhesive for the job. For instance, polycarbonate works best with epoxy, and acrylic requires an acrylic solvent adhesive.
Firstly, clean and pre-fit the parts to ensure they fit properly. Then, apply a small amount of glue to one surface. Check the curing time and allow the adhesive to fully cure before using the repaired item.
The Xuron® Model 860 Dispensing Bottle is a durable tool that allows for exact dispensing, reducing waste and ensuring accurate glue application. It comes with three applicator needle sizes: .010”, .020”, and .040”. Super glue also comes with precision applicator tips that allow for precise applications.
