finishing 1" shelf form by pouring a concrete shell to hold the latex. Latex has 10 coats and looks thick enough. Each coat of latex took roughly 5 hours to dry. Preparing a caster oil form release. Two oz of caster oil to 16 oz of 70% rubbing alcohol. Both oil and alcohol found at the grocery store in the medicines area. Concrete backer is roughly 3/4" thick using the 1/2" rough aggregate concrete
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