Chloe Zhang
Bondo is a plastic body filler that can be used to fill in cracks, seams, holes, and dents. It is a soft and pliable product that can be easily spread and moulded to the required application. It is important to note that Bondo is not meant to be used as an adhesive to join two pieces of plastic together. Instead, it is designed to fill in imperfections on automotive panels. When using Bondo on plastic, it is recommended to sand the surface rough enough for the Bondo to adhere and to clean it thoroughly with denatured alcohol.
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What You'll Learn
Bondo is not an adhesive
Bondo is a filler meant to fill in slight imperfections; it is not an adhesive. It is a flimsy surface filler/smoother that is lightweight and very brittle. Bondo has no strength or structural value and cannot be applied in thickness.
If you want to glue two pieces of plastic together, you will need to use glue or an epoxy. You can use Bondo to fill in the gaps between them, but you will first need to sand and clean the plastic with sandpaper and denatured alcohol. This will give the Bondo enough tooth to hold on to.
When using Bondo, it is crucial to get the right mix. A good rule of thumb is to use a 1:1 ratio of inch diameter of filler to inch-length of hardener. For example, a 4-inch diameter of raw filler needs a 4-inch ribbon of hardener at room temperature. If it is hotter than 85 degrees Fahrenheit, use slightly less hardener, and if it is colder than 65 degrees Fahrenheit, use slightly more. You only want to mix as much as you can use in about 10 minutes. Properly mixed, Bondo will begin to thicken in 10-15 minutes and be fully cured in 30 minutes.
If you are using Bondo to repair a car, be aware that it should not be applied in thicknesses greater than about 1/4 inch. While it is possible to apply it thicker, the repair will not last as long.
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Use on cracks and dents
Bondo is a putty used to fill in cracks and dents in plastic surfaces. It is an inexpensive, popular, and easy-to-use body filler. However, it is important to note that Bondo has no structural value and is not meant to be used as an adhesive. When using Bondo to repair cracks and dents, it is crucial to follow these steps:
First, ensure that the plastic surface is clean and free of any residue or dirt. Starting with a clean surface is essential as wax, bugs, tar, or dirt can compromise the adhesion of the Bondo. Next, sand the paint off the cracked or dented area using sandpaper or an orbital tool. This step ensures that the paint is removed from the damaged area, creating a smooth surface for the Bondo to adhere to.
After preparing the surface, it is important to mix the Bondo with a hardener in the correct ratio. The optimum mix is usually a 1:1 ratio of filler to hardener. For example, a 4-inch diameter of raw filler requires a 4-inch ribbon of hardener at room temperature. If the temperature is higher, use slightly less hardener, and if it is colder, use slightly more.
Once the Bondo is mixed, apply it to the cracked or dented area. It is important to remember that Bondo should not be applied too thickly, as this can lead to cracking and failure over time. A thin layer of Bondo is recommended, and if necessary, multiple layers can be applied once the previous layer has dried.
After applying the Bondo, allow it to dry completely. This may take around 30 minutes for the Bondo to fully cure. Once dry, sand the Bondo smooth using a sanding block or sandpaper. This process helps to create a seamless blend between the repaired area and the surrounding surface.
Finally, primer can be applied over the sanded Bondo to prepare the surface for painting. It is important to use Bondo sparingly and only when necessary, as excessive use can lead to cracking and other issues. Additionally, Bondo should not be used as a substitute for proper structural repairs or adhesive solutions.
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Sand plastic first
Sanding the plastic surface first is crucial when applying Bondo to plastic. Bondo is a filler meant to fill in slight imperfections and smooth out surfaces, but it is not an adhesive. Therefore, it is important to prepare the plastic surface before applying Bondo to ensure it adheres properly.
Before applying Bondo, use sandpaper to roughen the plastic surface. This will create a "'tooth" for the Bondo to grip onto. The recommended grit for sanding plastic before applying Bondo is 80-grit. However, some sources suggest starting with a heavier grit and working your way up to 80-grit. It is important to note that Bondo should not be applied to a thickness greater than 1/4 inch, as it may not adhere properly and may shrink over time.
When sanding, avoid sanding in straight lines. Instead, use a criss-cross or X pattern. This will help eliminate waves and ripples in the bodywork, resulting in a flatter and more even surface.
Additionally, it is important to clean the plastic surface thoroughly with denatured alcohol after sanding. This will ensure that the Bondo has a clean surface to adhere to and help create a stronger bond.
Once the plastic surface is properly sanded and cleaned, you can mix the Bondo with a hardener and apply it to the prepared surface. Remember to work quickly, as Bondo hardens fast, and only mix enough that you can use within 10 minutes.
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Mix Bondo with hardener
Bondo is a filler meant to fill in slight imperfections; it is not an adhesive. It is a flimsy surface filler/smoother that is lightweight and very brittle and cannot be applied in thickness.
When mixing Bondo, it is recommended to do so on a smooth, almost pore-free surface. You do not want to mix on something that will soak up any of the material. Additionally, you should mix Bondo outside where there is plenty of fresh air circulating, as the fumes may be dangerous. Do not use metal tools like screwdrivers to mix Bondo, as this may add grease or oil to the mixture.
The amount of Bondo and hardener you mix depends on the size of the area you need to patch. For a 3-inch diameter puddle of filler, squeeze out a 3-inch-long strip of hardener. This is the maximum recommended amount to mix at one time for optimal application. If you are mixing Bondo Glass, the filler and hardener are mixed in the same proportions as regular Bondo.
When mixing, add the hardener by squeezing it out of the tube across the top of the Bondo filler. Do not whip the substances; instead, fold them together to avoid introducing air bubbles. If you add too much hardener, the mixture will gel too quickly, and if you add too little, it will increase the time for it to cure. Once the Bondo and hardener are mixed, you have about 3 minutes to apply it before it starts to gel.
You can use hardener with dye in it so you can see when the mixture is mixed evenly. If there are no streaks in the filler or areas that are darker or lighter, it is mixed well.
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Bondo is lightweight and brittle
Bondo is a lightweight and brittle product that can be used to repair plastic. It is a filler meant to fill in slight imperfections; it is not an adhesive. When using Bondo, it is important to remember that there is no minimum thickness, but there is a maximum. Bondo should not be applied to anything thicker than about a 1/4 inch. If it is applied too thickly, the repair will not last as long.
To use Bondo, first remove all the rust scale and add a backup screen to cover the holes from the backside. Then, use Bondo-Glass over the rusted area, sand, and finish with regular Bondo body filler for a stronger repair. The mix is crucial – for every inch of diameter of filler, you need an inch-length of hardener. If your filler hardens too fast, you've used too much hardener, and if it takes too long, you haven't used enough.
It is important to note that Bondo has no strength or structural value. It is a flimsy surface filler that is lightweight and very brittle. It cannot be applied in thickness and will not provide any structural integrity. If you need to join two pieces of plastic, you will need to use glue or epoxy instead of Bondo.
While Bondo can be used on plastic, it is important to sand the plastic rough enough and clean it thoroughly with denatured alcohol before applying the Bondo. This will give the Bondo enough "tooth" to hold on to the plastic. However, even with proper preparation, Bondo may still flake off if the plastic flexes.
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Frequently asked questions
Bondo is a filler used to fill in cracks, seams, small holes, and dents. It is not an adhesive.
First, sand the plastic surface with 80-grit sandpaper and clean it with denatured alcohol. Then, apply the Bondo filler and let it dry. Finally, sand, file, or drill the Bondo as needed.
There is no minimum thickness for Bondo, but there is a maximum. It should not be applied to anything thicker than about 1/4".
The optimum mix is a 1:1 ratio of filler to hardener. For example, 4 inches of filler needs a 4-inch ribbon of hardener at room temperature.
