The BladeForums.com 2024 Traditional Knife is available! Price is $250 ea (shipped within CONUS).
Order here: https://www.bladeforums.com/help/2024-traditional/
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it's a moldable UHMW(ultra-high molecular weight) plastic. It doesn't require high temperature to set up and is water-proof. It's used for a variety of applications but, perhaps of interest to knife makers, it's used commonly for shaped handles on custom spear-guns. I'm not sure of it's overall durability as I've never personally handled it, but if it can handle being used on spear-guns, might be worth a shot on knives. I've been interested in trying it out on a knife but haven't got around to it yet.
I'm not entirely sure what you are asking but I think you want a material that you can heat, shape into grips, then cool and have them remain stable.
Yes, most any thermo plastic can be heated, shaped and cooled. Problem is they can be reheated (left in the sun, close to a stove, etc.) and once again become malible and chage shape again.
Body putty (Bondo, etc.) and teh epoxy putties can be shaped and once cured, won't change shape again with normal temperatures a knife might be exposed to. Problem is they are ugly as crap in most cases.
Not sure I was any help, but if I can answer any specific questions feel free to reask your question.
Jim Arbuckle