At this step of the operation assemblies are immersed or “invested”
into ceramic slurry. The properties of slurry are controlled to
an extent to give a uniform coverage of wax assembly. Whilst this
coat is still wet, a rather coarse refractory material coat is
applied onto it. The coated assembly is then let to dry. After
drying of the assembly number of successive coats of slurry and
studco (5 to 8 times) is applied.