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Home / R&R Academy / Defect Analysis / Positive Metal Defects / Pimples
Pimples
![pimples.jpg](https://static.wixstatic.com/media/cc5f22_e390653e51d842848ce57a24dcff2eb1~mv2.jpg/v1/fill/w_296,h_296,al_c,q_80,usm_0.66_1.00_0.01,enc_auto/pimples.jpg)
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.
Technical Support
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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.
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