Technician A: Plastic repair adhesives may be applied over paint.
- This is partially true. Plastic repair adhesives can adhere to painted surfaces, but the adhesion may not be as strong as on bare plastic. The paint layer can affect the adhesion and bonding of the adhesive.
Technician B: Melted plastic may cause poor adhesion to the plastic repair adhesives.
- This is true. If the plastic is melted or damaged before applying the repair adhesive, it will not provide a good surface for the adhesive to bond to. Melted, softened or degraded plastics will not adhere well to repair adhesives designed for plastics. The adhesive needs a clean, intact plastic surface to effectively bond to.
In summary:
- Plastic repair adhesives can work on painted plastics but adhesion may be compromised.
- Severely damaged, melted or degraded plastics will not provide good adhesion for plastic repair adhesives.
- For the strongest bond, plastic repair adhesives should be applied to clean, intact plastic surfaces.
So both technicians provided partially correct information, but Technician B identified an important limitation - that melted or damaged plastics will not adhere well to plastic repair adhesives. Proper surface preparation and condition are key to effective adhesion.