The material sometimes slips under the scraper, or the capillary attraction to the scraper blade can pull away more water than you intend. Imagine filling the mold with water and trying to scrape the top flat. Sometimes this can cause difficulty when getting the tops of the blocks scraped flat. You do not have to do this but can scrape it immediately if you like.īecause this is a flowstone, the material will start to turn into a liquid again once you start scraping. I like to let the material set in the mold for 5 minutes before scraping to let the material thicken up slightly. When pouring into the mold, it's better to pour it only the ridges between the blocks rather than directly down into the pockets of the mold. Since Merlin's is more of a flowstone, it has an additive that helps the stone stay very liquid, even if you add a lot of powder to the mix.īecause of this property, you will notice (if you watch the video above) that Merlin's pours into the mold a lot thinner than the plaster of Paris did. For the average size mold, I'm going to start with 1.5 ounces of water.Īfter mixing the Merlin's, your level should be about at the 3.5 ounce mark.įor detailed instructions on the measuring cup you see here and adding the powder to the water, refer to the Basic Casting Instructions page.
Stone casting plaster how to#
This video demonstrates how to mix Merlin's Magic and explains how much water and powder to use to fill an average sized mold.įor this demonstration, I'm using the Gray Merlin's (not the dark gray). I found that the tan or white colors take stain very well when casting the wooden plank and wood shingle pieces. Maybe it's just me but I've found that the dark gray has so much non-soluble pigment in it that tiny micro-bubbles form, kind of like foam that won't go away.
Merlin's Magic comes in white, tan, gray and dark gray. Shipping may be fairly expensive depending on how far you live from Arkansas. Most of these companies drop ship from Garreco (send the order to Garreco who ships it directly to you) which means that all their dental stone is sent from Arkansas using UPS Ground. Merlin's Magic is a type of flowstone made by a company called Garreco. You can call them at (919) 321-0938 -ask for Bethany. They Sell Merlin's Magic dental stone and accept Visa, Mastercard and Paypal and have an online shopping cart. They also sell lots of cool swords and historical gear.Ītlantic Dental Supply (material is shipped from Arkansas). They have an online shopping cart and offer several colors of Merlin's Magic dental stone in 5 lb., 10 lb., 25 lb. They have may types of dental stones available so be sure to check the compression strength before you order. They fit as much as they can into a US Postal Service flat rate box to give you the cheapest shipping cost possible. The Plaster Guys have an Ebay store where you can purchase various types of dental stone. You can order using their online shopping cart and shipping a 47 pound box seems to be reasonable. They carry Ultimate Drystone with a compression strength of 16,000 psi along with Hydrostone Super X which has a compression strength of 13,000 psi. Die Stones such as Excalibur and Die-Keen can go as high as 18,000 psi and cure so hard it's almost like a ceramic material.Īt this point I did want to list a couple of places you can purchase materials with a high compression strength:.Flow Stones such as Merlin's Magic are made to flow more easily and are around 12,000 to 14,000 psi.Hydrocal is around 6,000 to 8,000 psi and is more durable.
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