Spoiler Alert:

No salvageable cars were destroyed to make this post.
This Porsche 911 was sat upon hard, and put away wet.
Recently, Philipilihp posted about a Ducktail Porsche he was working on:

Philipilihp chose styrene over sculpting epoxy putty.
In the comments, TFritsch wondered if the ducktails from the old HWs 911 castings would work.
I thought, “hmmm, I have a couple beaters, lets see what can be done without cutting up a decent one.” So, the beater above is our subject. Let’s begin:

Just clean up my neck a little back there please...

Reminder, this is a beater...

That little nick will come back to haunt me...

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The rear grill is part of the window plastic on this casting, so we’ll need to bring it along.

You can see (I didn’t at the time) where some of the clay has oozed up between the plastic grill and the tail.

The glued together grill and fileted tail of duck are stuck to a bottle cap with a little clay to fill in the holes from my hasty saw job, and all the excess clay that squeezed out gets trimmed. Screw the cut off prescription bottle to the lid/base, and spray with a little mold release.
I’ve found this to be one of the best ways to create the molds, and the bottles are good for quite a few different pourings before they get tired.

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The molding parts are mixed... (I used the “Amazing” brand rubber and resin for this experiment, only because that’s what the local Michaels carries)...

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And poured.

Unscrew the base/bottle-top and wash off the clay. Pull out the original and wash the mold. Prepare the resin, and pour. There’s no photos of the resin being poured because I was working alone in the laboratory basement and one gets limited time before it starts to set.

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Left to right: Original zamac/plastic, first attempt, second attempt. See that little nick reproduced in all its glory?

The first pour is in the middle. I got an air bubble up there at the corner. I also played with the ink wash too long to get it all off. The second try, on the right came out much better, but it’s bright white and my camera isn’t bright anything. So, I painted it flat green to try and show some better detail.

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Still doesn’t photograph well, but this is what I got. I’m very pleased considering I was just doling it on a whim after reading the Ducktail Donnerstag post by Philip.
I may try again and go for as accurate a cast as I can, but that will mean destroying “decent” cars.

Oh well...

Anyway, the thing is that one can reproduce some of the less complicated styling features fairly quickly. The mold rubber takes 2-4 hours to cure, and the resin hardens in minutes. The pieces I made could be trimmed down to add to another Porsche quite easily. Well, the second one, anyway. The first attempt had too much resin...

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What do you think?