Question recreating ornate corners

[corigami]

I want to learn how to create an ornate corner for repairs. What are the materials used? I have not done this before. I've seen the videos online but can't find them anymore. Can you direct me to more instruction. Thank you!

 

[CB Art & Framing]

Dentist moulding putty

 

[Bruce Papier]

I haven't done this a lot, but I've made molds with Sculpey Moldmaker which is a clay which bakes into a rubbery material and used Durham's Rock Hard Putty for the actual casting.

 

[JFeig]

My casting material of choice is Hydrocal and molds made from modeling clay for the simple work and silicone rubber for reverse cuts and long life molds. Fiberglass threads can be added for extra strength of very thin parts.

 

[framah]

Plasti dip brushed onto the piece you want to reproduce. Mutiple layers till it is thick enough. Set it into sand to support the shape. Mix up some Hydro-cal plaster and pour into mold. It sets really fast.
Then Dremel the copy till it fits into place. Glue in and then refinish to match.