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Step 3Mix & Pour the Alginate
Mix the alginate with water according to the instructions. For Polytek Hydrogel N, combine 3 parts of water with 1 part of Hydrogel N by weight (approximately 1:1-1/4 by volume). Be sure to mix enough to totally cover the part.
Since the alginate is very light, a whisk works well to combine the components. Note that you'll have a fairly quick work time (5 minutes for Hydrogel N), so combine well, but also combine quickly.
Once combined, pour the alginate mixture over the part, ensuring the part is covered by at least 1/2 in. on top. If it looks thin on the top and you can still see or feel the part, cover with more--the second batch will still stick to the first if you pour more on within 5 minutes. Don't skimp--since what is now the top will become the bottom of the mold, you want to ensure it's thick enough so it won't break, tear, or deform.
Since the alginate is very light, a whisk works well to combine the components. Note that you'll have a fairly quick work time (5 minutes for Hydrogel N), so combine well, but also combine quickly.
Once combined, pour the alginate mixture over the part, ensuring the part is covered by at least 1/2 in. on top. If it looks thin on the top and you can still see or feel the part, cover with more--the second batch will still stick to the first if you pour more on within 5 minutes. Don't skimp--since what is now the top will become the bottom of the mold, you want to ensure it's thick enough so it won't break, tear, or deform.
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