I found a few bad dogbone resistors and thought it would be fun to try replicating them using
this technique.
My local JoAnn Fabrics had a sale on acrylic paint and I was able to get all 10 colors cheap

I got the epoxy putty at Home Depot and used corn starch for the releasing agent.
I messed up the first mold, but the next two turned out OK.
Here's the final result. Certainly not something I'd do on every project, but once you have the molds, it goes quickly.