Thread: how do you all do the transmission hump?

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My T is glass, so the tranny hump is too. After one failure building one ( I wasn't smart enough to realize resin eats styrofoam if you don't put a barrier between the two! ) I finally got a system that worked.

I made my shape out of stacked pieces of styrofoam insulating material I bought at Home Depot. I cut it with an electric carving knife to the basic shape. Then I put a layer of drywall joint compound over it all and sanded it smooth. I wouldn't have had to do the joint compound, but I salvaged my styrofoam before the resin from the first go round ate it all up. The compound filled in the low spots.

Then I put a couple of layers of Stucco Tape over the entire surface to act as my barrier and release agent. This red tape is similar to duct tape, but used to mask around windows on stucco homes, so it sticks like glue. Once I had the entire hump done in red tape I started laying up layer after layer of resin soaked mat until I had a new hump made from fiberglass.

When it cured the styrofoam and tape pulled out like butter on a hot knife, no sticking whatsoever.

Don