Ultracal 30 Plaster Casting Powder for Mold Casting, Scenery, Dioramas, and Dentistry Resealable Bag Great for Model Making & Gaming (10 Pounds).

Ultracal 30 is the best. I received it in two reseal able plastic bags and it was placed into a very sturdy box. I went by the directions on package for mixing by sprinkling the plaster/gypsum into the water. I let it set for a few minutes for the gypsum to soak up the water. I slowly mixed it with a wood spoon side to side like the directions said and wow I had no bubbles at all. It mixed very well. I am so impressed with this product for my crafting. But what I am most impressed about is the special service I received from the seller when the product was lost. The man I talked to at Artistic Industries, the seller, was courteous and apologetic. He said he was very sorry this happened and he would FedEx it to me overnight. A bad situation turned out to be very pleasant one. You don’t find too many people like that very often.

I was so skeptical when I purchased this, but after using it for the first time ...wow! It dries very hard and is incredibly smooth without any bubbles. I couldn't be more happy about this product. I have used other types of "plaster" for molds, but this product is superior. I have another bag of this stuff in my Amazon shopping cart right now. The seller is fast on shipping and excellent on price. If you make molds of statues and such, this is a fantastic product for that.

I bought this mix to make candle vessels, and it has some nice qualities. The color comes through beautifully — that raw cement look is exactly what I wanted. It also sets pretty fast and feels solid, not brittle. But I had a hard time getting a smooth finish. No matter how I poured or tapped the mold, I kept getting a lot of air bubbles. I tried a few different pouring techniques, but the surface never turned out 100% clean. So while it might work great for some projects, it didn’t quite meet my needs.

Awesome! Great for casting Bigfoot tracks!

Great for my rock casting, do make sure to gently tab or vibrate the sides of your container to get the bubbles out. It results in a much more durable end product.

If you're mathematically challenged like I am read this. The ratio is 38:100 water to plaster. That doesn't compute with me. How can I get 1 cup? Luckily I have a brother who is a math teacher! He wrote it out-view the photo. 2.24 oz water : 5.76 oz plaster = 1 cup mixed plaster. If you don't have a scale, buy one. The ratio is by weight. I figure 1 cup can be easily converted to whatever most of us need. 2 cups, just multiply by two (8.48 : 11.52 oz) a quarter cup, divide by 4 (0.46 : 1.44 oz) etc. Pour plaster to water NEVER water to plaster. Let it sit for about 5 minutes and then mix. I'm letting my mix sit while I type this so I have no opinions on it's quality atm but I wanted to share this while I waited. Hope it helps. Toodles.

Exactly what I needed to make kindness rocks to hide around my town.

It’s honestly okay but just that. It’s not meant for cement models of teeth. Once it hardened, when pulling it off silicone mold it would break easily. Use professional dental stone it’s wayyyy better.