I have a 50lb bag of Laguna Glacier casting slip. I'm not interested in casting this porcelain (bought it for another experiment that I now abandoned). So I decided to try mixing it to use as engobe for the interior of pots made of dark clays. Mixed per instructions I found on the *Internet*: 50lb of dry mix per 3 Gal of water to get 5 Gal of slip, and add some Darvan to deflocculate.
Since I'm only testing it for now, I mixed a smaller batch: 10lb to 2.27L and added 4 drops of Darvan. The slip I got is very thick, the consistency of pudding almost. Not sure what the reason is. Might be my Darvan is too old? I think the jar I have is at least 2 years old. This consistency is definitely not suitable for pouring into a pot and then pouring out.
What would you do? Add more water? Try to deflocculate further?