What is the difference between Hydrocal and plaster of Paris?

Hydrocal is much stronger than plaster of paris. It also takes lots more detail, and most of all does not ‘slough off’ like plaster of paris. That is important for a long life scenery base. The sloughing of plaster results in lots of dust and chips on a continuous basis.

What is Hydrocal made of?

Hydrocal is mainly composed of plaster of Paris and a small amount of Portland cement. It has a similar formula as hydrostone, duracal, and ultracal. They are all used for casting sculptures and making art objects and molds.

How do you use Hydrocal?

Sift or strew HYDROCAL Brand White Gypsum Cement into water slowly and evenly. Do not drop handfuls of HYDROCAL Brand White Gypsum Cement directly into the water. Allow soaking for 1-2 minutes. HYDROCAL Brand White Gypsum Cement should be fully dispersed in the water prior to mixing.

What is the hardest plaster?

PURITAN POTTERY PLASTER
PURITAN POTTERY PLASTER – Unique, specially designed for use with mechanical clay forming machinery. Absolutely the hardest, most wear-resistant plaster made for molds, and a favorite for jiggering molds. STATUARY HYDROCAL – A basic HYDROCAL cement with a lower use consistency of about 40 lbs. of water per 100 lbs.

How do you use lightweight Hydrocal?

The mix ratio of Lightweight Hydrocal is 5 parts Hydrocal to 2 parts water (1 1/4 cups Hydrocal to 1/2 cup water).

Does Hydrocal stick to wood?

A quick-drying lacquer applied by brush or spray gun is an excellent sealer for wood, plaster and gypsum-cement patterns and master models.

What is the difference between Hydrocal and Ultracal?

Ultracal 30 is more dense and harder than Hydrocal and is advertised by USG as a tool making plaster. Hydrocal is a casting plaster that hold detail well. If you need more specific help, please call Scott at Capital Ceramics 801-466-6471. Ultracal is more durable.

How long does Hydrocal last?

It’s not the most cost-effective way to purchase Hydrocal, but it comes in a convenient, re-sealable container. When my last jar got down to the bottom, I discovered that, even in a closed jar, it has a shelf life of a year or two.

How strong is Hydrocal plaster?

Designed for strength and casting detail. Hydrocal is 30\% to 40\% harder than casting plaster and works much like plaster in mixing, pouring, and setting.

How do you make a lightweight Hydrocal?

What is the mix ratio of Lightweight Hydrocal? The mix ratio of Lightweight Hydrocal is 5 parts Hydrocal to 2 parts water (1 1/4 cups Hydrocal to 1/2 cup water).

How do you make a plaster cast stronger?

If you are using regular Plaster of Paris, use ComposiMold Plaster Additive to make stronger castings that cure hard in ComposiMold molds. Regular plaster can leave dull/weak areas on the surface. The additive eliminates the soft skin from occurring in ComposiMold molds.