There are many ways to make a brick, but one of the biggest decisions is which concrete or mortar to use. I have a bunch of plaster and hybrid gypsum products like Duracal and Tufstone. These materials set quick, but have a very low tolerance for water absorption and become chalky and fall apart. I like the detail I get from gypsum plaster products, but they will not last outside. For making the original castings I can use the gypsum plasters like Duracal and they look at lot like cement so they work well for samples.
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