Pimples present as sharp grains on the casting surface. This defect indicates that the metal managed to slightly penetrate the primary shell coat in some areas.
Struggling with a specific casting defect or just need general technical support?
Email our technical team at: Technical@ransom-randolph.com.
The causes of this defect are evident in the shell portion of the process. To cure these causes, R&R recommends taking the following actions.