Once Axalta management became established at plant sites they systematically began the process of replacing former DuPont employees with new employees at a lower pay scale. In most cases the former DuPont employees were not ready to leave but were forced out anyway. Axalta showed no appreciation for those employees who spent many years of dedicated service to the company.
Unfortunately when it comes time to make cuts... salaries have to be looked at first, since they're such an easy target. People usually don't want to discuss a salary cut... ever... so most businesses don't tend to go with that approach.