Post #387851 by tikitony on Wed, Jun 18, 2008 11:05 AM

Wow, great thread here. That Okidoki mug is AWESOME!!! On my molds, I forgot to put in a funnel, so the rims of my mugs end up being a pain to fix. Great job on the photos and process. Makes me want to get started on my next mug!

I was able to make a master mold by putting the plaster pieces in a box, with flatsides down for an open faced mold. I clear-coated the plaster, then sprayed Mold Release, and I then poured $150 worth of mold making latex over the four pieces. I had a 4 piece plaster mold, so I put two pieces in a box, then the other two in another box.

After the latex dried, I just popped out the plaster mold from the latex. This plaster mold was unusable because it had been clearcoated, which stops the absorption of water.

I then mixed a lot of plaster for 2 days straight, pouring mold making plaster into the latex molds and in two days, I had 5 working molds for a mug! A few of the mold pieces had gotten warped, but a master mold maker friend soaked them in water with the rubber bands on tight, and was able to fix them so no clay slip leaked out anymore!