Super sculpey polymer clay, cure at home.
Like all polymer clays, super sculpey can be cured in a conventional home oven. It never dries out and is reworkable until cured. Which is great for projects that take a long time, as oposed to air drying clay, which has a limited working time.
I used to use super sculpey, the normal pink / beige one, but found it to be a little translucent. Which made fine detailing very difficult.
The firm grey however is opaque, and the firmness much better for carving and shaping fine details.
The main issue I've had with this product is varying consistencys in the firmness of the clay. It should be quite 'stiff' to work with, most of the blocks I've had have been ok, but I've had some that have been very soft and sticky. Thus very difficult to work with. I've even found the consistency vary within an individual block.
I've since discovered that the soft clay can be firmed up by placing thin sheets between layers of paper to leach out some of the oils. Which is a bit of a pain, and waste of paper, especially when part way through a sculpt.
Super sculpey is one of those materials that I'm still learning about, and learning how to get the best from it.
A couple of tips ive learned, that aren't on the packaging... Your can add new sculpey to baked sculpey. A very thin smear of Vaseline helps the clay to stick, and acts as a 'glue'.
99% rubbing alcohol can be used to smooth the clay during the sculpt. It slightly dissolves the surface of the clay, and if worked with a soft brush can remove imperfections like fingerprints and tool marks.
If you find the firm clay a little too difficult to work with, it can be mixed 50/50 with the normal super sculpey, for a medium blend. Sculpey do actually have a medium blend available, but i am yet to find a uk stockist.
Overall its a great clay to work with, and there's some fantastic work being created with it, just look on Google.
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