The Making of the 88-SS, 300ZX (Z31) Spoiler a.k.a. “Lip”.


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88-SS Shiro Spoiler


87 - 89 “TBO” Spoiler


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87 - 89 No Spoiler


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First, you get a generous person to loan you a new SS lip to make the mold from.


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Attach a stabilizing bar to keep it from losing its overall dimensions and any warping.


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Mask off the back side to protect it from damage during the mold making process.


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Make a plaster mold for making wax sheets.
Melt wax and pour.


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Two sheets won't do it but eight will.


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Now, form the wax sheets around the back so that the edges extend over the outside edges of the model


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Fortunately, the model had studs that could be used to hold the wax sheets in place.


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Using soft plasticene clay, smooth and blend surface of wax sheets into the edges of the model.


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Apply a coat of high carnuba paste wax, spray a coat of PVA mold release and allow to dry. Apply a second coat of wax and PVA.
Relax and have two beers then take a picture.


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Spray a coat of jell-coat and allow to set up.
Apply 2 layers of glass cloth and two layers glass mat.


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Cut and shape one inch Styrofoam sheet to from reinforcing ribs.  Polyester resin will melt or dissolve Styrofoam. To prevent this apply a thin veneer of "Bondo", automotive body repair paste, with either a brush or trowel. Bondo contains polyester resin but sets fast enough to prevent the foam from melting.

These ribs can be made from plywood or even heavy cardboard. I prefer the foam as it is easy to shape and adds very little weight to the mold.


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These ribs will be covered with fiberglass, as seen below.  The model is held by a jig that is attached to a large round rotating (Lazy-Susan) work surface. This allows the model be be rotated for easy mold building. A screw stop is used when rotation is not required.


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Close up of the Styrofoam ribs covered with 2 layers of glass cloth with the support stand attached.


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The original OEM SS spoiler ("model") is still in the mold. The back side still has the blue masking tape covering the surface.


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Mold stand and bracket attachment.


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This is how the mold will sit for "lay-up".



Most of the raw materials  for this project were purchased from Douglas and Sturgess in San Francisco and Richmond California. 510-235-8411

If you use this source, ask for Artie and mention my name, Gary Molitor.  Place orders with Donna.


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