Turbine blades and IGT hot-section parts leave no room for shell defects. A thin patch in one coat, an uneven stucco layer, or a variation in drain time can show up later as a runout or an inclusion. Foundries working to aerospace specifications need shell building that repeats without drift. Laxminarayan Technologies supplies automated shell room equipment built for that requireme... https://www.ic-machines.com/robotic-shell-building/