Plastic is present in many parts of modern cars, from front bumpers, rear bumpers to dashboards and interior details. When these parts are cracked, broken or damaged, the two most common repair methods are using plastic glue or plastic welding. Each solution has its own advantages and disadvantages.
Welding plastic for higher durability
Plastic welding is a method of melting compatible plastic surfaces and then linking them together. This technique is mainly applied to thermoplastics, a type of material that is capable of melting and reshaping when heated.
The biggest advantage of plastic welding is that it creates a very solid bond. Because plastic molecules are melted and mixed together, the durability of the welding joint can reach from 80% to 100% compared to the original material. Thanks to that, after-repaired parts are more resistant to vibration, impact and temperature changes than using glue.
In addition to durability, plastic welding also helps shorten repair time because it does not need to wait for the material to dry. This is a suitable choice for load-bearing parts such as car bumpers, supports or dashboards.
However, this method requires specialized equipment and the performer must have knowledge of each type of plastic. Not all types of plastic can be welded, and the cost of machinery investment is also quite high.
Flexible and easy-to-use plastic glue
Compared to plastic welding, plastic glue is more accessible to ordinary users. Main repairs include cleaning the surface, applying glue, and waiting for the glue to solidify.
The outstanding advantage of glue is that it can be used on many different types of materials. In addition to linking plastic with plastic, glue can also attach plastic to metal, fiberglass or rubber. This is also almost the only solution for thermodurals, which cannot be welded in the usual way.
The initial investment cost for plastic sealing tools is also significantly lower than professional welding equipment. Therefore, this is a suitable choice for minor repairs or situations that require quick fixing.
However, the durability of the glue is usually only about 30% to 50% compared to the original material. Glue is also easily affected by high temperatures, strong vibrations or continuous impacts.
Which method should I choose?
The choice between plastic welding and glue depends on the type of plastic as well as the location to be repaired.
If the part is made of thermoplastic and requires high durability, plastic welding is usually the optimal solution. Conversely, for solid thermoplastics or details that need to be linked to other materials, glue is a more suitable choice.
In practice, many technicians combine both methods in the same repair process to achieve the best results. It is important to identify the right type of material before repairing to ensure durability and safety when using the vehicle.
