Making plaster of Paris Molds

Discussion in 'HO Scale Model Trains' started by Prof1000, Jan 6, 2008.

  1. Prof1000

    Prof1000 New Member

    Hi I have a black rubber mold that I fill with plaster of paris to make rocks for mountains. The problem is I have trouble at times getting it out of the mold without it cracking. Any one have any suggestions for making this job easier. Thanks in advance.

  2. yellowlynn

    yellowlynn Member


    I generally use a spray of soapy water, just to get it wet, then pour the POP. It works for me. I have even used WD-40, very light coating. Make sure the mold is clean before you pour. Lots of luck.

  3. GN.2-6-8-0

    GN.2-6-8-0 Member

    Hydrocal or sculptamold ,either are a better product to use than plaster of paris. their stronger and dry slower making them much easier to work with.

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