Maya Ellison
Gluing clear plastic to paint can be a tricky task, and it's important to choose the right adhesive for the job. Different types of plastics require different types of glue, and using the wrong one can lead to unwanted fogging or discolouration. For instance, cyanoacrylate (CA) glue, or super glue, can fog clear parts and make it difficult to rebuild a model later on. PVA-based glues like Elmer's or Micro Scale Kristal Klear are recommended by some for gluing clear plastic, as they dry clear and can be cleaned off easily if you make a mistake. For the clearest finish, it may be best to use an adhesive sheet rather than a liquid glue, as these can show through as patches on the plastic.
Characteristics and Values Table
| Characteristics | Values |
|---|---|
| Type of Glue | PVA-based, super glue, epoxy, cyanoacrylate (CA) glue, poly cement, 3M adhesive sheets, UV resin |
| Type of Plastic | Polyethylene, polypropylene, polystyrene, PVC, ABS, polycarbonate, acrylic |
| Other Considerations | Clear parts glue, surface energy (HSE/LSE), wetting the surface, cure time, solvent-based adhesives |
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What You'll Learn
Choosing the right glue for clear plastic
When choosing the right glue for clear plastic, it's important to consider the type of plastic you are working with. Different types of plastics require different types of adhesives, so identifying the specific plastic is crucial. The recycling symbol on the plastic can be a helpful indicator.
For clear, brittle plastics like imitation glass or CD cases, polystyrene is commonly used. In such cases, a poly cement is the recommended adhesive. On the other hand, if the plastic feels similar to a Lego block, an epoxy cement or cyanoacrylate will be a better choice.
If you're dealing with hard, high-density plastics like those used for buckets, crates, or containers, look for polyethylene or polypropylene-based adhesives. Ordinary glues like white glue or wood glue are not suitable for these plastics. Instead, opt for a strong, two-part cyanoacrylate adhesive like the Loctite Plastics Bonding System, which dries clear and sets quickly.
For flexible plastics commonly found in household items such as shoes or toys, choose adhesives specifically formulated for flexibility. The Loctite Vinyl, Fabric & Plastic Flexible Adhesive is a clear liquid adhesive that dries clear, is waterproof, and forms a flexible bond that resists UV/sunlight exposure.
Additionally, when gluing translucent or frosted acrylics, consider using adhesive sheets or tapes, as liquid glues may show through and affect the clarity. Adhesive sheets, such as 3M Adhesive sheets, can provide a clearer finish and strong bonds on slick surfaces.
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Surfaces that are hard to glue
When it comes to gluing clear plastic on paint, there are a few things to keep in mind to ensure a strong bond. Firstly, it's important to select the appropriate glue for the specific materials you are working with. Clear plastic can be a tricky surface to work with, and certain types of glue may not adhere well or cause fogging. Here are some surfaces that can be challenging to glue:
Teflon Plastic
Teflon plastic, commonly used in non-stick cookware, has properties that make it challenging to glue with some adhesives like cyanoacrylate (CA) glue. It is chemically resistant and does not easily degrade, making it harder for adhesives to form a strong bond.
High-Density Polyethylene
High-density polyethylene is a common plastic used in packaging, such as plastic bottles, lumber, piping, and geomembranes. CA glue does not adhere well to this type of plastic, so alternative adhesives may be required for a successful bond.
Oily and Dirty Surfaces
Oily and dirty surfaces can pose challenges for gluing. Most glues, including CA glue, will not bond well with oily surfaces unless they are thoroughly cleaned first. Similarly, dirty surfaces may require sanding or cleaning before gluing to ensure a proper bond.
Translucent Acrylics and Clear Plastics
When working with translucent or clear materials, liquid glues can sometimes cause issues. They may show through as patches or not provide a strong enough bond. In such cases, adhesive sheets or tapes designed for transparent surfaces might be a better option.
Smooth Surfaces
While a smooth surface typically provides a stronger bond than a rough surface, burnished areas on wood can be problematic. Burnishing alters the chemical characteristics of the wood, preventing it from bonding with the polyvinyl alcohol portion of wood glue. To test for burnished areas, place a drop of water on the surface; if it doesn't soak in, the surface needs to be sanded before gluing.
When gluing clear plastic on paint, it's important to consider the specific materials and choose the appropriate adhesive. Some glues may not be suitable for clear plastics, and the paint surface should be clean and properly prepared to ensure a strong bond.
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Removing super glue scars from clear plastic
When working with clear plastic, it is best to avoid using super glue as it can cause cloudiness and fogging. If you do end up with super glue residue on your clear plastic, there are a few methods you can try to remove it. Please note that some of these methods are suggested by hobbyists and may not be suitable for all types of clear plastic.
One method is to use a very fine polishing compound, such as Brasso, which should not scratch the surface of the plastic. It is important to test this method on a spare piece of the same plastic first, as some polishing compounds contain ammonia, which can damage certain types of plastic.
Another option is to use a product specifically designed to dissolve super glue, such as super glue debonder or Zap gel CA remover. After using these products, you may need to use a polish designed for plastic to clean off any remaining marks.
Additionally, Future Floor Polish, an acrylic gloss coat commonly used by aircraft modellers, can be used to fill in microscratches and protect against super glue fogging. If super glue gets on a surface where it is not wanted, an ammonia-based cleaner can be used to remove the Future Floor Polish layer and the glue on top of it.
In some cases, it may be necessary to replace the clear plastic entirely. This is especially true if the super glue has caused significant cloudiness or fogging that cannot be removed through polishing or other methods. When replacing clear plastic, it is recommended to use a dedicated clear parts glue, such as a PVA-based glue, to avoid future issues.
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Gluing clear plastic to wood or canvas
Choosing the Right Glue
The type of glue you choose will depend on the material you are gluing to and the strength of the bond you need. For gluing clear plastic to wood, a gel-based super glue is recommended, especially if you are working with porous wood. Porous wood can absorb regular super glue before it bonds with the plastic, so a gel-based formula will give you a better chance of success. If clarity is your top priority, opt for a fast-drying, clear glue.
For gluing clear plastic to canvas, hot glue or clear gorilla glue are recommended options. Hot glue dries almost instantly and will hold the weight of the plastic well. Clear gorilla glue will also work but takes a long time to dry.
Preparing the Surfaces
Before you start gluing, it's important to prepare the surfaces you'll be working with. If you're gluing to wood, lightly sand the plastic surface to make it more porous and increase its surface area, allowing it to bond more easily to the wood. Just be careful not to damage the plastic with too much sanding. Clean the wooden surface with a damp cloth to remove any dust or dirt that might interfere with the bond. Then, wipe it down with rubbing alcohol to remove excess dust, oils, and moisture.
If you're gluing to canvas, it's a good idea to do a test spot on a small area of the canvas first to make sure the glue won't damage or discolour it.
Applying the Glue
When you're ready to glue, apply the glue to both surfaces. Be careful not to use too much, as a little goes a long way with super glues. You can use stripes, dots, or swirls of glue, depending on the size and shape of the surfaces. For small or irregularly shaped objects, try using a toothpick to apply the glue.
Once the glue is applied, guide the smaller piece into place on the larger piece and apply constant pressure until the glue has dried enough to hold securely. Find a flat, stable surface to set the pieces as they finish drying, and avoid handling them as much as possible during the curing process.
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Using glue that dries clear
When gluing clear plastic on paint, it is important to consider the type of plastic and choose an appropriate adhesive. Different types of plastics require different types of glue, and some plastics are very difficult to glue. Clear, brittle plastics like imitation glass or CD cases are usually polystyrene, and a poly cement will work best on these.
If you want a clear finish, it is recommended to use a PVA-based glue. These glues dry clear and can be cleaned off with a wet Q-tip or paper towel if any excess glue squeezes out. Super glue, on the other hand, can fog clear parts and make it difficult to remove glued components without damaging them.
One recommended product is Revell Contacta Clear, which is used on aircraft canopies and dries clear without fogging. Another option is to use clear resin, which can be applied with a small brush to bond the clear plastic to the frame.
For gluing clear plastic to wood or canvas, one suggestion is to paint a UV resin on the backs of the acrylic pieces and then peel away any excess. Adhesive sheets, such as 3M Adhesive sheets, can also provide a clear finish and are easy to apply.
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Frequently asked questions
You can use PVA-based glues like Elmer's glue or Micro Scale Kristal Klear. These glues dry clear and can be cleaned off with a wet Q-tip or wet paper towel. You can also use Testors clear part cement or Revell Contacta Clear.
You can try using a superglue debonder with a small brush and work carefully. You can also try using very fine sanding sticks to polish off the glue.
Paint a UV resin on the back of the acrylic pieces and then peel away any excess.
Different types of plastics require different types of glue. Clear, brittle plastics like imitation glass or CD cases are usually polystyrene, and a poly cement will work best on these. Legos are made of ABS, and an epoxy cement will create a sufficient bond. Polyethylene and polypropylene plastics are very difficult to glue and require a specific adhesive.
