After the first layer, I add more clay... this time, I'll try a shallow vertical wall to better retain the bottom edge and maybe form a lip to help hold the hard outer shell I'll later add.
Next, with the wall in place, I mix up some fast curing Smooth-On™ Oomoo 25 (75 minutes!) as there is a lot of it around TechShop for my class.
I use fairly old, on the shelf (used, open bottle--etc) Smooth-On™ Oomoo 25 as it tends to go off faster (thus making it a little unpredictable for class), this will allow me to form a nice "globby" coat for the first layer detail coat, yet still be pourable-ish to flow where needed.
... this layer was "hand smoothed" as it cured, so more of the material ended up on top of the job. This a tedious way of doing things, but I had none of my trusty Cab-o-sil on hand for thickening the layer. Cab-o-sil is great for adding, by degree, a lightweight thickener.
Curing now, I'll post more as I do more :)
Next: The Hard Outer Shell!
© Tom Twohy 2011