Some foundries have observed poor shell adhesion to QuickCast patterns. A few even developed methods to improve shell adhesion such as coating the pattern with a spray adhesive. We suspect, however, that shell adhesion problems were the result of other deviations from standard shell procedures since there are many foundries that have not had problems with shell adhesion.
3D Systems has tested patterns using a number of slurries and various finishes including:
Sandblasted (smooth or rough)
Good slurry adhesion was obtained in all cases.