Other: Does anyone know where to find Ultracal 30 gypsum cement in PA, NJ or DE?
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View Poll Results: Which material is best for making molds used for casting latex and foam props?

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  • Ultracal 30

    5 62.50%
  • Hydrocal White

    2 25.00%
  • Silicone with Resin or Plaster Bandage Shell

    1 12.50%
  • Rubber with Resin or Plaster Bandage Shell

    0 0%
Results 1 to 5 of 5
  1. #1
    Join Date
    Mar 2012
    Collegeville, PA

    Question Does anyone know where to find Ultracal 30 gypsum cement in PA, NJ or DE?

    Sculptors and mold-makers: does anyone know where I can purchase Ultracal 30 somewhere within 1-2 hours of the Philadelphia area? As you likely know, Ultracal is the best gypsum product to use in mold making and it is also extremely hard to find. It is readily available online but the cost of shipping does not make it feasible. It is my understanding that Ultracal can be found in un-seeming places like ceramics shops and lumber yards. If anyone has a lead of where I can buy Ultracal 30 gypsum cement in my area, I would greatly appreciate it.

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  3. #2


    I got mine at Clayworks Pottery Supplies in Baltimore, MD, which looks like it's about 2 hours from Philly. Last year it wasn't part of what they stocked regularly, but they're getting a lot of requests for it, so they were considering adding it. They're also totally willing to add it to their regular order. I think I paid ~$30 for a 50lb bag that someone had special ordered but hadn't picked up. Also a great source for sculpting clay (tho that probably goes without saying. ).


  4. #3


    Actually, you have an option in Philadelphia as well. They have way more selection than my place in Baltimore. http://www.theceramicshop.com/store/ Look under Dry Materials --> Plasters ... $24 for a 50lb bag.

  5. Default

    Hydrocal is the best for slip latex it is more porous and dehydrates the latex better. If your doing foam latex go for ultracal. Remember hydrocal can't be built up in layers you've got to do it all at once. I will always choose a epoxy syntactic molds over any stone, but if you are just starting out this process is kind of dangerous and very hard. Once you learn how to do all the basics you can jump into things like fiberglass and epoxy molds.

  6. #5
    Join Date
    Mar 2012
    Collegeville, PA


    Maskmaker: funny you should say that; I have been getting all of my WED clay and plaster from The Ceramics Shop in Philly for the past several months. However, they only stock Hydrocal and Ultracal is special order. I placed an order for Ultracal 3+ weeks ago and they don't have it yet. They tell me that their supplier is on back-order and they have no timetable as to when it may arrive. This may very well be the case. However, when I'm in the middle of a project, I can't wait a month + for the materials that I need. That's why I am looking for an alternative provider. I feel that I may have to suck it up and pay 100% shipping costs at this point. Why is Ultracal SO hard to find locally? Philadelphia is an art city.



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