Maya Ellison
Filling gaps in plastic is a common problem for model builders, and there are a variety of methods and materials that can be used. The best approach will depend on the size of the gap, the availability of materials, and personal experience and preference. Some people prefer to ensure surfaces mate flush instead of filling gaps, but this paragraph will focus on the materials and methods used to fill gaps in plastic.
Characteristics and their values to fill gaps in plastic
| Characteristics | Values |
|---|---|
| Gaps and seams filling materials | Green stuff or white stuff, Water-based pastes, Mr Surfacer 500, Sprue and glue mix, Sheet plastic plus liquid filler, Superglue (CA) plus baking soda, Bondo, Poly-cement, Plastic glue, Citadel Glue, Tamiya Extra Thin Cement, Sprue Goo |
| Gaps and seams filling tools | Mini Sanding and polishing sticks, High grit sandpaper |
| Gaps and seams filling techniques | Filling gaps in stages, Pinching the two halves together after filling the gap with poly-cement, Trimming the bead of plastic after filling the gap with sufficient glue, Sanding them smooth after filling the gaps |
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What You'll Learn
Use superglue and baking soda
Filling gaps in plastic can be done in several ways, one of which is using superglue and baking soda. This method is ideal for smaller holes. It involves a simple process that can be completed in a short amount of time.
First, attach a sturdy piece of cardboard to the back of the hole with tape or a hand clamp. This will prevent any material from running through the hole and give the glue a flat edge. Then, squeeze three or four drops of super glue into the hole to create a small pool.
Next, sprinkle a pinch of baking soda on top of the glue and press it down firmly with your finger or a flat edge. The baking soda acts as an accelerant, causing the glue to harden quickly. Layer the glue and baking soda until the hole is filled, making sure to keep the layers even.
Once the hole is plugged, let the patch dry and harden for around 15 minutes. After this, you can remove the cardboard backing. If there is any residue, you can use sandpaper or a fine-grit metal file to sand away any buildup.
This method provides a quick and sturdy fix for small holes in plastic. It is important to note that you should use a runny liquid formulation of superglue, as thicker gels may not harden properly. Additionally, always be cautious when using superglue to avoid getting it on your skin.
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Try sheet plastic and liquid filler
Filling gaps in plastic can be done in a variety of ways, depending on the availability of materials and your level of experience. One method is to use sheet plastic and liquid filler, which is particularly effective for large gaps.
To do this, you will need a sheet of plastic, such as a flat scrap piece, and a liquid filler. You can create your own liquid filler by mixing a half-full bottle of liquid glue with sprues until a paste is formed. Alternatively, you can use a solvent-based adhesive for plastics, such as Humbrol's "Poly Cement", or epoxy putty.
Before applying the filler, reinforce the gap from the inside if the plastic is flimsy or if something could fall through. Then, apply the liquid filler to the gap and let it cure. This process can take up to 1-2 days, depending on the type of liquid filler used. Once cured, the filler will have a plastic-like consistency and can be sanded down if needed.
For smaller gaps, a mixture of superglue (CA) and baking soda in a 1:1 ratio can be used. This mixture dries quickly and can be sanded, but it is important not to let it cure for 24 hours as it will become harder than the plastic and will be less sandable.
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Fill with water-based pastes
Filling gaps in plastic can be done using a variety of materials. Water-based pastes such as Vallejo or Perfect Plastic Putty are easy to apply and can be smoothed with a wet finger or cotton bud before they dry. This method is ideal for small gaps as it tends to shrink a little.
To fill gaps in plastic using water-based pastes, start by ensuring the area is clean and free of debris. Apply the water-based paste directly into the gap, using a small spatula or similar tool. Smooth out the paste with a wet finger or a cotton bud to create a flat, even surface. Remove any excess paste from the surrounding area before it dries. Allow the paste to dry completely, which may take a few hours. Once dry, you can sand the filled area if needed to create an even smoother finish.
Water-based pastes are a good option for filling small gaps in plastic as they are easy to work with and can be smoothed before they dry. They are also water-based, making clean-up and handling safer and more convenient compared to solvent-based fillers. These pastes are typically available at hobby shops or online and are designed specifically for use with plastic models and similar applications.
When using water-based pastes, it is important to work quickly as they tend to dry relatively fast. It is also important to note that while they can be sanded after curing, it is best to create an even surface before the paste dries to minimise the need for extensive sanding. Additionally, these pastes are best suited for small gaps as they do shrink slightly upon curing, so larger gaps may require multiple applications or alternative filling methods.
Compared to other filling methods, water-based pastes offer a convenient and user-friendly approach to filling small gaps in plastic. They dry to form a strong and durable bond, similar to that of the original plastic, ensuring a seamless repair. With their ease of application and ability to be smoothed before curing, water-based pastes are a popular choice for hobbyists and professionals alike when addressing gaps in plastic components.
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Sand down with high-grit sandpaper
Filling gaps in plastic requires the right approach and materials to ensure smooth and professional results. Sanding plastic is a crucial step in this process, and using the correct sandpaper grit is essential to achieving the desired outcome.
When filling gaps in plastic, it is important to start with a coarse grit sandpaper to address any heavy imperfections or deep scratches. This initial sanding stage aims to create a relatively smooth surface while removing any major blemishes. The recommended grit range for this step is between 60 and 180, with lower numbers indicating a coarser grit.
After addressing the initial imperfections, it is time to move on to the next sanding stage. This is where medium-grit sandpaper comes into play. Medium grits, ranging from 220 to 400, are perfect for further smoothing and refining the surface. This step is crucial, especially for 3D print post-processing, as it reduces visible layer lines while still allowing for controlled material removal. It is also commonly used for acrylic and plexiglass finishing to soften sharp or rough edges before progressing to the finer sanding stages.
The final sanding stage before the polishing process begins is where fine-grit sandpaper comes into action. Fine-grit sandpaper, ranging from 600 to 1000 grit, is used to remove any small scratches or imperfections left by the previous sanding stages. It creates a clean and even surface, ensuring that the plastic is ready for the final polishing process. This stage is crucial in achieving a smooth finish before painting, sealing, or applying any other desired coatings.
For those seeking an exceptional, glass-like finish, ultra-fine grit sandpaper is the answer. With grit sizes ranging from 1200 to 3000, this stage eliminates any remaining micro-scratches and imperfections. It prepares the plastic surface for buffing and polishing compounds, ensuring a flawless and glossy appearance. To achieve the best results, it is recommended to use a wet sanding technique, which helps prevent heat buildup and ensures even sanding. By submerging the sandpaper in water beforehand or keeping it moist during the process, consistent performance and a scratch-free finish are guaranteed.
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Apply epoxy adhesives
Epoxy adhesives are a great option for filling gaps in plastic. They are strong and can be used for both structural and cosmetic purposes. You can either buy pre-thickened epoxy adhesives or make your own by blending an epoxy/resin mixture with a thickening agent (filler). Colloidal silica is a popular choice for a thickening agent, creating a strong, non-sagging adhesive. Other fillers, such as microballoons, can also be used alone or in combination with other fillers for different purposes.
When applying epoxy adhesives, it is important to consider the size and configuration of the gap. For narrow gaps, you can use a syringe with a large needle or a plastic straw cut down to a couple of inches. The epoxy can be loaded into the straw, and then gravity and pinching the straw will work the glue into the gap. Alternatively, you can use a small plastic bag and pipe the epoxy into place like a baker decorating a cake. For larger gaps, you can mix the epoxy with a credit card and push it into the gaps.
It is important to note that warming the epoxy after mixing will thin it out, but this will also accelerate the cure time. You can also thin epoxy glue by mixing it with acetone, which will create a super-strong bond that fills gaps without foaming.
When using epoxy adhesives, it is important to tape off the area with blue tape and wipe down the excess epoxy with rubbing alcohol before it dries. This will ensure a clean finish.
Epoxy adhesives are a versatile and strong option for filling gaps in plastic, offering both structural and cosmetic solutions. With the right techniques and considerations, they can be an effective way to fill gaps and create a durable bond.
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Frequently asked questions
Gaps in plastic can be filled with a variety of materials, including:
- Superglue (CA) and baking soda
- Sheet plastic and liquid filler
- Green stuff or white stuff
- Water-based pastes
- Mr Surfacer 500
- Sprue and glue mix
- Poly-cement
The best method for filling gaps in plastic depends on the size of the gap and your personal preference. For small gaps, a water-based paste or Green Stuff/Liquid Green Stuff can be used. For larger gaps, a sheet plastic and liquid filler or superglue and baking soda mixture may be more effective.
To fill gaps in plastic models, you can use a plastic glue, such as Tamiya Extra Thin Cement, to melt the plastic and weld it together. You can also create your own filler by mixing liquid glue and sprue. Once the gap is filled, you can use sanding tools to smooth out the surface.
