How to mix Plaster:

<!--[if !supportLists]-->1.      <!--[endif]-->Always weigh out the amount of plaster you need, then look up the water by weight percentage. For example USG #1 Pottery for making molds uses 70% water to plaster. So 5 lb. of plaster requires 3.5 lb. of water. First weigh out the plaster you need, take that amount and multiply it by .7, (point seven, 70%)  this gives you how much water to use.

<!--[if !supportLists]-->2.      <!--[endif]-->Generally speaking the larger the percentage of water the softer and more absorbent the plaster will be. The harder the plaster the less water used.

<!--[if !supportLists]-->3.      <!--[endif]-->Hot water will speed up the set time and cold water will slow it down.

<!--[if !supportLists]-->4.      <!--[endif]-->Place the water in a suitable sized container. Always add plaster to water. Pour the plaster into the water and let slake for one minute. Mix by hand or with a Jiffy Mixer, being careful not to suck air into the plaster. When the mixture is lump free it is ready to pour; don’t wait for it to start to thicken.  It should look like whole milk when you pour the plaster.