questionswhat was the rapid prototyping material that…

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Continuing to do searches, I thought I'd mention that this was a hand-moldable mold as oppose to a vacuum or injection type mold...

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You may be thinking of Sugru? "Sugru Moldable Silicone" https://sugru.com/

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That's intriguing stuff, but what was previous posted became firm and permanent upon drying. There was an instructable linked of someone using it to support an LED invention as well, if that triggers anyone's memory. I'll definitely be looking into Sugru, though! Thanks!

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I'm pretty sure this is what you want. It was sold out last time I looked at the site though.

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@jimeezlady: Turns out that was the stuff, the branding is just slightly different now and it wasn't familiar. Thank you so much for the response!
@zuiguan: That's the post I remembered, I just really hadn't remembered the name...much appreciated.

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Glad you found your answer!