Alginate Casting

11 Mar

Over the past couple of weeks I have been creating a plaster cast of my own hand, in order to then transform it into a fibreglass core, ready for sculpting onto for my final special effects project.

ALGINATE CASTING

YOU WILL NEED

  • Tepid Water
  • Mixing Bowl
  • Alginate
  • Drill with Squirrel attachment
  • Plaster

METHOD

  1. Mix together the alginate with tepid water until you have a porridge like mixture.
  2. Pour 1/2 of this mixture into the casting receptacle. Then place the body part you wish to cast into the mixtures, in this case. the hand. It is important to remove and bubbles that will be attached to the hand, we need to rub out the areas around and under the nails in particular, rubbing the fingers together to rid ourselves of any bubbles that may cause imperfections.

    Hand in Alginate

    Hand in Alginate

  3. Continue to pour the rest of the Alginate in, until the hand is covered and part of the wrist.Leave a 0.5-1″ gap at the top of the receptacle.
  4. Leave the mixture for about 5minutes until it has gone off, then slowly wiggle your hand and finders until the suction is released. Be careful not to carry out this process too quickly as the suction strength may cause the interior to fold in on itself.image62
  5. Mix up the plaster in a ventilated area, until the consistency of double cream. Pour a thin layer into the mould and rotate around the mould, ensuring the plaster coasts every orifice, then pour this plaster out again.
  6. Pour in another layer of plaster, again coating the whole mould, allow to settle in the bottom, tapping gently to release any bubbles. repeat this process until the mould is filled to the brim and then leave for two hours to set.image63
  7. Once the plaster has set, remove the receptacle and use a blunt wooden tool to carve away the alginate, ensuring the plaster mould is not touched.

image65

Voila.

Voila.

 

This method is particularly good as it picks up fine details very easily and efficiently. For information on the next step of this process, please look out for my “creating a fiberglass core” post.

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