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Home / R&R Academy / Defect Analysis / Positive Metal Defects / Spalling on Edges
Spalling on Edges
![spalling-on-edges.jpg](https://static.wixstatic.com/media/cc5f22_e04da6f05a4d4cef994c6306b03620fe~mv2.jpg/v1/fill/w_296,h_296,al_c,q_80,usm_0.66_1.00_0.01,enc_auto/spalling-on-edges.jpg)
Spalling on edges presents as rough filling in the corners. This defect indicates that there was a poor bond between the first coats and the backup shell in these corners; causing primary coats to pop off (areas of primary coats popping off of edges).
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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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