Mold Making Questions

[SchubroProductions]

I have an old Hatbox Ghost face that came off an old Disney Tombstone of mine that I wanted to try making a mold of. As you can see from the pictures it is a hollow resin cast with very rough back edges. I've cut out a section of foamcore that I was going to lay the piece in and seal with clay and then begin to create a detail layer with a naptha/silicone caulk layer and build it up from there. I was going to attempt a mother mold from plaster bandages after that but don't know if I should create a two part shell or a shell that would just lie over the top. As you can tell by the pics, the chin provides a pretty big undercut. Any suggestions on how to approach the mother mold?

 

[ultraman]

do you even need to go through all that trouble!?!?! couldn't you just do a 1 piece silicon block mold?!?!?

 

[robn1]

I was thinking the same thing. It looks like it has a flat back, just secure it to the bottom of a box making sure there are no gaps. Then pour silicone.

 

[BrundelFly]

something that small? A mother mold is a waste of time.

 

[SchubroProductions]

Thanks guys. That is what I will do then.

 

[SchubroProductions]

Holy crap this is taking over 4 lbs of silicone.

 

[Kevin Gossett]

How big of a box did you make for it?

 

[SchubroProductions]

1/4 inch clearance on all sides and depth. The piece itself is 8 " long 6 " wide and 2 1/2" deep.

 

[robstyle]

for future reference, the mold box does NOT have to be four sides. You can do angles and such to cut out voids. You can also use blocks of wood or other material to further cut the silicone usage yet those blocks will need to be kept for the molds own rigidity. You can also angle the sides inwards.

example:

 

[robstyle]

double post

 

[SchubroProductions]

Yep. Wish I had thought of that. Lesson learned.

 

[Contec]

Yep. Wish I had thought of that. Lesson learned.

You can cut away the excess silicone and use that for filler for next silicone mold. if you chop it up in smaller parts.