After leaving the mold to dry for several days I was able to use my slip cast mood today. First of all I cleaned up the plaster with a wet sponge in order to get rid of any clay left from the mold making process.
I then drilled a hole in the top section of the mold in order to pour the slip in. This was filed down and then smoothed out with a knife.
I mixed up the slip so that there was no lumps in. This was then sieved into a clean bucket.
I filled the bottom of the goblet with more slip so that it would be easy to clean out after drinking from it. After leaving this for a while the slip level dropped so in the end I filled this other a ball of clay and some more slip. This compromise now means that the stem is hollow however had I not done it this way I think the stem may have became too weak and may have collapsed whilst the clay was drying.
The slip was then left for two hours to harden a little before taking apart the mold. I first scraped the clay from the pour hole in the top section. I then carefully removed each part of the mold so as not to damage either the mold or the goblet.
I spent a few hours cleaning up the seams with a knife. I had some trouble with the stem cracking under the weight of the top. I am hoping I have filled this in and repaired it enough for it to survive the firing process.
I cut the top in a circular shape for this piece however I may change this to follow the lines of the outside on later models.