a method of molding an inner or cover layer of a thermoset or thermoplastic material around a golf ball core within a compression mold , in which the core is positioned within a mold cavity containing preformed inner hemispherical shells and holding the opposing mold portions in a closed position wherein heat and pressure are applied . knockout pins engage the core and layer to biasly eject it from the mold cavity , while simultaneously blowing high pressure air into the mold cavity to aid in releasing the core and layer without the need of a release agent coating the cavities .