Chloe Zhang
Car interiors are bound to pick up scratches, marks, and cracks over time, especially if the car is used regularly for family duties. These imperfections can make the car look old and worn out, and negatively affect its resale value. To address this, there are various methods and products available to restore car interior plastic, ranging from temporary solutions such as plastic and vinyl cleaners and dressings to permanent refinishing options using paints specifically designed for plastic and vinyl. For more complex repairs, such as fixing broken plastic trim, one may consider using epoxy or super glue (cyanoacrylate), ensuring that the type of plastic is identified as some plastics require special treatment before painting or using epoxy.
How to Reattach Car Interior Plastic
| Characteristics | Values |
|---|---|
| Prevention | Prevent plastic from cracking by protecting it from sun exposure and keeping it away from high-stress areas |
| Cleaning | Clean the plastic surface with a microfiber towel, interior detailer, or a multipurpose cleaner |
| Repairing | Use epoxy, cyanoacrylate (CA) glue, or JB Weld to repair cracks and gaps in the plastic |
| Refinishing | Use paint designed for plastic and vinyl, such as ColorBond LVP, to refinish and restore the plastic |
| Protection | Apply a trim restorer and protectant, such as Turtle Wax Trim Restorer, to protect the plastic from UV damage, fading, and cracking |
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What You'll Learn
Clean the plastic surface
Cleaning the plastic surface of your car's interior is a simple process that can be done with a few tools and precautions. Firstly, it is important to gather the necessary equipment: a vacuum cleaner with various head attachments, a bucket of warm clean water, a soft-bristled detailing brush, a selection of microfibre cloths, and an all-purpose cleaner (APC) or interior detailer.
Before beginning the cleaning process, it is essential to remove any personal belongings, rubbish, or debris from the vehicle. This ensures that you have a clear space to work with and prevents any accidental damage to your belongings.
Once the interior is cleared, it's time to vacuum. Use the soft brush attachment on the vacuum nozzle to gently remove any loose surface dust and dirt, being cautious around any knobs, vents, or electronic displays to avoid scratching or damage. Pay special attention to areas that are more heavily soiled, such as door sills and the footwell, and use a detailing brush to gently loosen and remove built-up dirt in these areas.
After vacuuming, you can use a soft damp cloth or a soft handheld dust mop to wipe down the plastic surfaces. It is important to only use water on the cloth, as car electronics do not react well to moisture. For stubborn stains, you can apply a small amount of mild soap, laundry detergent, or a plastic auto cleaner directly to the cloth, being careful to avoid overspraying the product onto the plastic. Use gentle, circular motions to lift dirt and stains, ensuring even cleaning and minimizing streaks.
If you have used a soap solution, it is important to wipe down the plastic again with a clean, damp cloth to remove any soap residue. Finally, dry the surfaces with a soft microfiber cloth.
It is recommended to test any cleaning products on a small, inconspicuous area first to ensure they do not discolour or damage the plastic. Additionally, keeping the car windows open during the cleaning process improves ventilation and helps surfaces dry more quickly.
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Use a heat gun to repair scratches
Car interiors are prone to scratches, which can make the car look worn out and negatively impact its resale value. While there are several ways to fix scratches, using a heat gun is one of the most effective methods to repair scratches on car interior plastics.
To repair scratches on car interior plastics using a heat gun, you will need a heat gun, fine sandpaper, and an interior car cleaner. Start by cleaning the plastic surface to prepare it for repair. Spray some interior car cleaner onto a microfiber towel and rub it onto the surface in circular motions to remove dirt and grime. Then, use another microfiber towel to wipe off the dirt and excess cleaning solution. Ensure that the plastic surface is clean and dry before moving on to the next step.
Once the surface is prepared, turn on the heat gun to the recommended heat setting and apply the heat to the scratched area. It is important to keep the heat gun constantly moving at a safe distance from the plastic to ensure even heat exposure and prevent "wet spots" or melting. Keep the heat gun a few inches away from the plastic and move it up and down or in a circular motion. Stop heating if you notice the plastic starting to lose its texture or becoming discoloured.
After applying heat, you can use fine-grit sandpaper to gently sand down the repaired area and smooth out any remaining imperfections. Finally, clean the surface again with an interior car cleaner and a microfiber towel to remove any debris from the sanding process.
Using a heat gun to repair scratches on car interior plastics is a relatively simple process that can significantly improve the appearance of your car's interior. However, it is important to exercise caution to avoid causing further damage to the plastic. Always follow the recommended heat settings and keep the heat gun moving to prevent overheating and melting the plastic.
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Identify the type of plastic
Plastic has become one of the most frequently used materials in vehicle manufacturing. There are two major categories of plastic: thermoplastics, which melt and typically require an adhesion promoter, and thermosets, which are flexible and do not require an adhesion promoter. To identify the type of plastic in your car, you can use the following techniques:
Check the Colour of the Raw Plastic
The raw plastic's colour can provide a visual indicator of its type. For example, polypropylene, commonly known as PP, is a thermoplastic with excellent chemical and heat resistance. It is frequently used in car bumpers, gas cans, and carpet fibres.
Identify the Plastic's Properties
Different types of plastics have distinct characteristics. For example, polycarbonate is a tough and lightweight plastic with high impact resistance, making it ideal for car window controls and safety equipment. On the other hand, polyurethane (PU) is a versatile plastic commonly found in car interiors for its aesthetic and functional properties.
Examine the Texture and Finish
Some plastics have distinct textures and finishes. Acrylonitrile Butadiene Styrene (ABS) has a shiny and rubbery surface, making it flexible and ideal for automotive parts. ABS is commonly used in dashboards, steering wheel covers, and body components.
Look for Identification Codes
Modern vehicles may have identification codes or number plates that specify the exact composition of a plastic part. These codes are usually delimited by the symbols ">" and "<" and can provide detailed information about the type of plastic used.
Perform a Grind Test
A simple test to distinguish between thermoplastics and thermosets is to lightly grind the plastic. If it smears, it is a thermoplastic; if it powders, it is a thermoset. This test can be useful when deciding on the appropriate repair or refinishing products for the plastic.
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Use epoxy to fill in gaps
Epoxy is one of the most common ways to fix broken plastic automotive trims. It is important to note that different plastics need different treatments, so make sure to do your research when handling plastic repair tasks. Before using epoxy to fill in gaps in car interior plastic, the area must be cleaned. You can use wax and grease remover, window cleaner, soapy water, or plastic solvent. Some cleaning supplies might suit different plastic types better than others. Sand off any paint and rough edges in the area as well. For larger gaps, cut a V-shaped groove between the pieces to give the epoxy more surface to hold onto. Roughly sand down the plastic to give the epoxy a better surface to cling to.
The epoxy typically comes in a two-part pack, one containing the polymer or prepolymer and the other containing the hardener or curing agent. Mix the two according to the directions on the packaging to activate the epoxy, and use the resulting mixture to fill in the gap in the trim. Make sure to follow the directions for mixing the epoxy. If you don’t get the mixture right, the epoxy might not hold. Some epoxies harden in as fast as five minutes so work carefully but quickly. Depending on the epoxy, it might take longer to fully cure. Make sure to mix the epoxy parts together thoroughly so it hardens properly.
For larger cracks, use mesh tape across the crack to make a sort of backing for the epoxy, and apply the epoxy in layers rather than in one large glob. You can also make your own thickened epoxy by blending the epoxy/resin mixture with a thickening agent (filler), such as colloidal silica, so it can bridge large gaps in structural applications without loss of strength. Or you can use a pre-thickened, non-sagging mixed epoxy product packaged in a convenient cartridge, such as West System Six10 and TotalBoat Thixo (regular formula, not Thixo Fast Cure).
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Use super glue to repair broken tabs
Superglue is a good option for repairing broken tabs on car interior plastic. It is a common and easily repairable adhesive. However, it is not the strongest option available. For a stronger repair, plastic epoxies are recommended.
To repair a broken tab using super glue, first, clean and roughen the surfaces that will be joined. This will help the glue adhere better. Next, apply the super glue to both surfaces and join them together. Hold them in place until the glue dries. This may take several hours.
If the broken tab has completely broken off, you can create a new tab using a product like Q-bond. This is a "powder/filler" and superglue combination. Form the new tab using some taped cardboard as a mold, then drill a small hole into each exposed fracture surface and insert a small piece of wire or paperclip to pin and support the repair.
For a more durable repair, you can use a product like 3M™ Super-Fast Repair Material, a fast-curing plastic adhesive. First, grind the broken tab area using a 3-inch 60-grit 3M™ Roloc™ disc, creating a tapered edge. Then, sand the repair area with an 80-grade abrasive disc to remove any shiny plastic. Drill 1/8-inch pinning holes in the damaged area, about 1/4 inch apart. Next, apply an aerosol adhesion promoter to the sanded area. Cut a contour film sheet to three times the length of the tab and fold it over the repair area, then mix and apply the plastic adhesive. Shape the adhesive between the folded sheet, ensuring it flows through the pinning holes.
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Frequently asked questions
It depends on the type of plastic and the severity of the damage. For small cracks, you can use an adhesive like super glue or epoxy. For larger cracks, use mesh tape across the crack to support the epoxy. If the plastic has broken off, you can weld it with a plastic welding tool or fuse it with epoxy.
ColorBond LVP is a paint designed for plastic and vinyl that can make your car interior plastic look new. It is flexible and adheres as the surface flexes, expands, and contracts, preventing it from cracking and peeling.
First, clean the area with wax and grease remover, window cleaner, soapy water, or plastic solvent. Then, mix the two parts of the epoxy according to the directions on the packaging. Use the mixture to fill in the gap in the trim, working carefully but quickly as some epoxies harden within five minutes.
Yes, but avoid the oily types as they do not stick well. You can use medium-thick glue for filling small gaps and thicker glue for larger gaps. Use a razor blade to smooth out the glue and skip this step.
Clean the plastic surface with an interior detailer, a multipurpose cleaner, or a plastic solvent to remove dirt, grime, and sharp contaminants. Be sure to clean intricate spaces like air vents and dashboard crevices with a cotton swab or small detailing brush.
