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How to mold auto car parts - steering wheel
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How To Mold Antique Car Steering Wheel

As with any normal two piece mold, begin by starting with a bed of Alumilite’s Synthetic Modeling Clay and pressing your part (the steering wheel) into the bed of clay.  Then build the clay up to your determined parting line.  It is important to have a very clean and straight parting line to reduce flash and post clean up of your cast resin piece.  So spend the time necessary to make sure the line where the clay touches the steering wheel is straight and clean.  Then build your mold box around the part and inside the part to take up the extra space between the rungs of wheel.

Once you have the part clayed up and the mold box sealed, mix your silicone rubber and begin to pour.  We are using Dow Corning’s Silastic M-2 mold making rubber for this part because the undercuts are minimal but we still want great dimensional stability as well as tear strength.  Start by drizzling the rubber over the steering wheel.  This will wet out the surface of the part and allow the air bubbles to more freely rise up and away from the surface of the part.  If your part has a lot of undercuts, you may not wish to do this step.  But due to the size of the part and the openness of the mold box, this process helps to make sure the air releases from the surface of your part.

Once the critical detailed surface is covered, begin pouring the bulk of the rubber in the center of the mold box allowing the silicone to flow naturally over the part until it completely covers the wheel.

Make sure the liquid rubber covers the part by at least ¼”-3/8” and make sure your mold box and inside cavities are not leaking.  Allow the rubber to cure overnight.

Once the rubber has cured, flip the mold over, remove the mold base, and begin digging all of the clay off of wheel.  DO NOT remove the wheel from the poured silicone rubber mold.  The seal between the mold and wheel is critical in producing a smooth/clean seam line. 

Continue cleaning all of the clay off of the part until absolutely no clay can be seen.  Once all of the clay is cleaned off, cut locators in the surrounding flange areas of the silicone rubber that will align the two halves of the mold.  Mold release the entire mold and part with Alumilite’s UMR release to ensure the two halves of the rubber do not stick to one another.  It is not necessary to mold release the part but with this piece it would be next to impossible to cover every bit of the cured silicone without getting some on the part.  Then mix and pour the second half of your two piece mold.

Once the second half of the mold rubber has cured, remove mold from the mold base, box, and inner box cavities.

Find the seam line with your fingers and begin separating the two halves of the mold.

Slowly work the mold apart following the seam line between the two halves.

The mold will separate cleanly and you will now have a beautiful two piece mold with locators that will line up the two halves beautifully.

Now you are ready to prepare the mold for casting.

Using Alumilite’s Key Knife, cut a wedge in the mold to produce a pour hole for the resin.  For cosmetic reasons cut the half of the mold that will be the back of the steering wheel.

This piece will be inserted back into the mold immediately after the resin has been poured into the mold before it cures.

Using plywood, create a splint that will maintain the dimensional integrity of the mold and will make for easier handling of the mold while pouring.  Two pieces of wood with holes drilled so bolts can hold it together work great. 

The bolt holes will line up with the holes in the mold left to take up space and will not interfere or touch the silicone at all.

Use this mold to Cast a piece >

lease call us toll free if you have any questions regarding your mold making or casting project.  800 447-9344


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