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Flex additives are blended into paint before application to keep the finish flexible and prevent it from flaking off or cracking. They are typically used for painting flexible plastic parts. However, opinions vary on whether flex additives are necessary, as some people claim that properly applied paint should not crack or peel from flexible parts. Additionally, flex additives may alter the colour of the paint slightly. When deciding whether to use a flex additive, it is important to refer to the tech sheet or manual for the specific product to understand the appropriate mix ratio and usage instructions.
| Characteristics | Values |
|---|---|
| Purpose | Flex additive is used to ensure paint adheres to flexible plastic auto parts and to keep the cured paint finish flexible long enough to be assembled without flaking off or cracking. |
| Use | Flex additive should be used when painting flexible plastic parts. |
| How to use | Flex additive should be mixed with paint before it is applied. |
| Ratio | Flex additive and paint should be mixed in a 1:1 ratio. |
| Colour | Flex additive is translucent white and will not affect the final colour of the paint once it dries. |
| Limitations | Flex additive should not be used when painting rigid surfaces. |
| Alternatives | Adhesion promoter is an alternative to flex additive. It is applied directly to bare plastic rather than being mixed into the paint or primer. |
| Durability | The properties that make flex additives desirable are temporary, lasting only weeks or months at most. |
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What You'll Learn
Flex additive is not required for pre-mixed paint
The use of flex additives is temporary, with the desirable properties lasting only weeks or months at most. Eventually, the paint hardness will match the rest of the finish. As long as the paint has been applied properly, it should not crack or peel from flexible parts, except in the case of a severe impact.
Flex additives are also known as flex agents, and they are blended into paint before it is applied. They were developed when vehicles began using soft plastic exterior parts like bumpers, grilles, and other body trim. Their role was to prevent the paint from flaking off or cracking during the assembly of these parts.
While flex additive is not required for pre-mixed paint, it is important to note that if you are painting a flexible plastic part, you may need to use an adhesion promoter. Adhesion promoters are chemicals that act as a surface preparation for bare plastics, enhancing their acceptance of paint. They are typically applied directly to the plastic rather than mixed into the paint or primer.
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Flex additive is needed for flexible plastic parts
Flex additives are used to ensure paint adheres to flexible plastic parts. They are blended into paint before application and are particularly useful for post-production repairs where flexible parts may be handled more off the vehicle.
Flex additives are useful when painting flexible plastic parts because they keep the cured paint finish flexible long enough to be assembled without flaking off or cracking. However, they are not always necessary. For example, one source notes that they have been painting for over 20 years and have never had a job come back for paint cracking on a flexible part.
The need for a flex additive also depends on the type of paint being used. For instance, acrylic enamel paints tend to be brittle when cured, making flex agents a necessity. On the other hand, modern paints like acrylic urethanes adhere better, so a flex agent is not always required.
It is important to note that the properties that make flex additives desirable are temporary, lasting only weeks or months at most. Eventually, the paint hardness will match the rest of the finish, and the flex additive will evaporate. Therefore, while flex additives can be useful for flexible plastic parts, they may not be necessary for all applications.
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Flex additive is temporary and evaporates over time
Flex additives are temporary and will evaporate over time. They are not meant to be a permanent solution and are only designed to keep the cured paint finish flexible during installation or assembly. This is particularly useful for flexible plastic auto parts, such as bumpers and body trim, where the part may be handled off the vehicle.
Flex additives are modifiers that are blended into paint before application. They help to ensure that the paint adheres well to flexible plastic surfaces. However, they are not meant to prevent cracking or peeling in the long term. While flex additives can provide some flexibility during the curing process, they will eventually evaporate, leaving the paint to harden and match the rest of the finish.
The evaporation time of flex additives can vary, but it is generally expected to occur within weeks or months of application. One source mentions that flex additive can evaporate within two weeks, although this may depend on various factors such as temperature, humidity, and the specific type of flex additive used.
It is important to note that flex additives are not a substitute for proper paint adhesion. While they can provide temporary flexibility, they do not enhance the bonding between the paint and the surface. In fact, paint adhesion is generally a greater concern than flexibility when it comes to plastic parts. To improve paint adhesion on plastic surfaces, an adhesion promoter can be used.
In summary, flex additives are temporary solutions that evaporate over time. They serve a specific purpose during the installation or assembly of flexible parts, but they do not provide long-term flexibility or crack resistance. Proper paint adhesion and the use of suitable primers are more critical factors in preventing paint cracking or peeling on flexible surfaces.
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Paint adhesion is a greater concern than flex for plastic parts
When painting plastic parts, paint adhesion is a more significant concern than flexibility. Plastic parts, especially flexible plastic parts, can be challenging to paint due to their low surface energy and polarity, which hinder paint adhesion.
To improve paint adhesion on plastic surfaces, it is essential to start with a thorough cleaning process to remove any soils, dirt, fingerprints, dust, lint, mould release residues, and detergent residues that may inhibit adhesion. Power washing followed by a solvent wipe is a commonly recommended cleaning method. An innovative alternative is the use of CO2 integrated spray, which has been mandated by BMW and other German OEMs for cleaning interior plastic parts.
Once the surface is clean, the next step is to enhance the paint's adhesion to the plastic. This can be achieved through various techniques, such as using an adhesion promoter or a flex agent. An adhesion promoter is typically applied directly to the bare plastic rather than mixed into the paint or primer. It chemically scuffs the surface, improving the plastic's ability to accept paint. Most thermoplastics, such as TPO, TPRU, ABS, and SMC, require an adhesion promoter.
On the other hand, a flex agent or flex additive is blended into the paint before application. Its purpose is to keep the cured paint finish flexible, preventing flaking or cracking during assembly or handling. However, flex agents are considered less crucial than adhesion promoters for plastic parts since the paint hardness will eventually match the rest of the finish, and properly applied paint should not crack or peel from flexible parts.
In conclusion, while both adhesion promoters and flex agents have their roles in painting plastic parts, ensuring proper adhesion is the more critical factor for a successful and durable paint job.
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Flex additive is blended into paint before application
Flex additives are modifiers that are blended into paint before application. They are used to ensure that paint adheres to flexible plastic auto parts, such as bumpers and grilles, without flaking or cracking. Flex additives are typically added to paint that takes a hardener and are particularly useful when painting flexible parts that may be handled off the vehicle, such as during post-production repairs.
When using flex additives, it is important to follow the manufacturer's instructions for proper mixing and application. For example, Maker Pro Paint™ recommends mixing their FLEX Additive with their paint in a 1:1 ratio before thinning with distilled water. It is also important to note that flex additives are temporary and may evaporate over time, so they may not provide long-term protection against cracking or peeling.
In addition to flex additives, adhesion promoters are another type of chemical treatment that can be used to improve paint adhesion on plastic parts. Adhesion promoters are typically applied directly to the plastic surface rather than mixed into the paint. They chemically "scuff" the surface of the plastic, enhancing its acceptance of paint. However, it is recommended to not use adhesion promoters when painting flexible surfaces.
While flex additives can be useful in certain situations, some people argue that they are not necessary for all painting applications. Some experienced painters claim to have never used flex additives and have not encountered issues with cracking or peeling. Ultimately, the decision to use a flex additive will depend on the specific requirements of the painting project, including the type of surface being painted and the desired level of flexibility and adhesion.
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Frequently asked questions
Flex additives are modifiers that are blended into paint before application to keep the finish flexible, preventing it from flaking or cracking.
Flex additives should be used when painting flexible plastic parts to prevent the paint from cracking.
When using a flex additive with pre-mixed paint, follow the mix ratio specified by the manufacturer. For instance, Maker Pro Paints™ recommends a 1:1 mix ratio of paint to flex additive.
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