Overmolding, also known as secondary forming, is a secondary processing technique. Instead of injecting two different plastic materials simultaneously on a single machine, it involves injecting them sequentially. The process unfolds in two distinct stages: First, the base product is molded and ejected from an initial mold. Then, this partially completed product is placed into a second mold for a subsequent injection step. Typically, this process requires two separate molds and does not necessitate a specialized dual-color injection molding machine. This technique is generally employed for applications where a soft rubber material is overmolded onto a hard plastic substrate. The first injected material serves as the base material or substrate, usually a rigid plastic, while the second is the overlay material, typically an elastomer.