How To Make a Keying Mould Knife

In this mouldmaking instructional video from Smooth-On, Milo shows how you can make your own mould knife using readily available, affordable blades. Mould knives create a key in your mould when you cut the mould, which helps the mould register and align properly when casting resin, rubber, foam, or other materials. A mould that registers well will give the least amount of flashing when making props, sculptures, or other types of pieces.

 

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