I want to make a long thin mould to pour in silicone, I think cereamic would be best as I have made these before on a dimension 3d printer and it speeds up the curing process if you warm the mould up after pouring (and de gassing). and the plastic versions melt.
My question is one about the thickness of the glaze.
It would be useful to know.
a) The thickness of the glaze roughly as I am sure it varies.
b) Do we add this thickness to our model, (Hence make the mould a bit larger to allow for the extra thickness) or does way you submit the job allow for the thickness of the galze.