How can I tell if my modelling clay is waterproof?
Md Ariful Islam
বিএসসি(সিএসই)
,
এমবিএ(মার্কেটিং)
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Dr. Md Rushad Rahman
এমবিবিএস(আরপিএমসি)
,
পিজিটি(মেডিসিন)
Make a small ball of clay that you don't need and let it soak in a cup on water for a few minutes. If you take it out and it either crumbles or becomes malleable again, it is not waterproof.
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