How to Cast a Resin Slot Car

Written by kennethgraham
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How to Cast a Resin Slot Car
Exact replicas of this body can be reproduced in resin. (sporty model car image by Ray Kasprzak from

Many exact resin replicas of a master slot car body can be made for very little cost as long as you start with a carefully prepared mould. An existing car body can be the master or an original master body can be carved out of wood, clay or plastic. Whichever is used, the master should be as flawless as possible since even tiny marks will be reproduced. The materials and equipment needed for resin casting are available from most hobby supply stores.

Skill level:
Moderately Challenging

Things you need

  • Sandpaper
  • Filler putty
  • Plastic or styrene sheet
  • Exact-o knife
  • Super glue
  • Modelling clay
  • Paper cup
  • Popsicle stick
  • Silicon rubber mould material
  • Rubber to rubber mould release
  • Liquid resin mix

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    Creating the Mold

  1. 1

    Sand the master body carefully and fill any blemishes with modelling putty.

  2. 2

    Cut pieces from plastic sheet for a box large enough to hold the car and the mould material. Cut an oversized piece for the base.

  3. 3

    Fill the inside of the master body completely with modelling clay. The clay should fit tightly to the edges of the windows and lower body. Carefully clean any clay from the outer surface of the master.

  4. 4

    Make a bed of clay a little larger than the mould box and set the bottom of the clayed-up master firmly on the bed. The lower body edges must be completely exposed.

  5. 5

    Set the clay bed onto the mould box base. Trim the bed to the size of the box and assemble the box sides around the bed. Glue their edges together.

  6. 6

    Mix part of the silicon mould material in a paper cup. Carefully pour it into the mould box to cover the roof of the car plus enough for a sturdy mould. Allow the silicon to set overnight.

  7. 7

    Flip the box over and remove the plastic base. Completely remove all of the clay from the lower half of the box.

  8. 8

    Apply mould release to the underside of the upper mould half.

  9. 9

    Mix the rest of the mould material and pour into the mould box. Allow the second mould to set overnight.

  10. 10

    Disassemble the mould box, separate the mould halves and remove the master body.

    Casting a Slot Car Body

  1. 1

    Mix the resin material in a plastic cup, carefully following instructions. Slowly pour the resin into the upper mould half, filling the cavity.

  2. 2

    Press the lower mould half into the cavity. Squeeze excess resin material out the sides and make sure no air is trapped. Allow the resin to fully set.

  3. 3

    Separate the mould halves and remove and clean the newly cast body.

Tips and warnings

  • Cleanliness is important every step of the way when casting with resin. Any flaw or spec of dirt can be reproduced in a resin casting.

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