The Aeromold process differs in that it is baked at a low 100 °F (38 °C) at cutting and forming, and 180 °F (82 °C) for fusing together sections after the resins are added.

[3] In 1939, at the onset of World War II, the company operated as the Timm Aircraft Corporation, building the PT160K trainer prototype using the aeromold process.

[5] A Plywood construction variant, the CG-4B was developed by Timm in case of material shortages, but did not go into production.

After World War II, the company specialized in returning surplus Douglas C-47 aircraft back into airliner configurations.

[7] The company also created a subsidiary, Timm Industries, Inc to manufacture vending machines such as the Frank-O-Matic and Coca-Cola bottle dispensers.