When repairing plastics, Technician A uses an adhesion promoter after grinding. Technician B states that dust from sanding indicates it can be repaired with standard adhesives. Who is correct?

In the context of repairing plastics, it's important to understand the roles of adhesion promoters and the consideration of dust from sanding. Technician A is employing best practices by using an adhesion promoter. This product enhances the bond between the surface of the plastic part and the adhesive, especially after the surface has been ground. The grinding process can create a rough texture that helps improve mechanical bonding, but using an adhesion promoter further increases the likelihood of a successful repair, particularly on challenging plastics.

Technician B makes a valid point by indicating that dust from sanding can suggest that the plastic is suitable for repair using standard adhesives. When plastic is sanded down, a fine layer of dust is produced, which often indicates that the surface is free from contamination and ready for adhesive application. However, this does not necessarily replace the need for an adhesion promoter, as some plastics benefit significantly from this additional step regardless of sanding.

Both technicians highlight essential aspects of the repair process. Technician A covers the importance of using an adhesion promoter to ensure strong adhesion, while Technician B addresses the condition of the plastic surface after sanding, which can be indicative of its repairability with standard adhesives. Therefore, both are correct in their statements, leading to the conclusion that both approaches are valid in the context of repairing