Advice needed for casting large open model parts
- Thread starter userd1402
- Start date
JPH
Sr Member
There is a guy here, name is Thorisil or something lie that, garden gnome for a pic, and he makes YUGE warcraft armor sets.
You can slush cast, but holding a 20 lb mold with resin ans dancingb around is gonna make for a great workout video.
If it has fine details, I would make your master prop. Brush on a light layer of Rebound 25, constantly working it, constantly working it. After the first layer, add a little Thivex, like ONE DROP per4 oz. And apply. Keep adding layers of Rebound with Thivex until 1/4 to 3/8 inch thick.
For final layet of Rebound, cutbout foam pieces and coat them in Rebound 25.
Let Rebound dry/cure.
Coat Renound in mold release.
Next, get a hoola hoop or something like that, with a circumference that spans the open/back part of your cast. Use FreeForm air or Plaster o Paris to make a hard outer mold in ATLEAST 2 detachable parts.
You dont want to make a hard outer mold that you cannot pop off!!
Cover the hula hoop with plastic wrap or cheapo plastic bag and only surround it half way around with FreeForm or Plaster.
If you can, make the center of the hard mold round.
After plaster or FreForm cures/hardens yiu are ready to pour.
Pour and use hula hoop and round center to move the piece around.
Viola!
You can slush cast, but holding a 20 lb mold with resin ans dancingb around is gonna make for a great workout video.
If it has fine details, I would make your master prop. Brush on a light layer of Rebound 25, constantly working it, constantly working it. After the first layer, add a little Thivex, like ONE DROP per4 oz. And apply. Keep adding layers of Rebound with Thivex until 1/4 to 3/8 inch thick.
For final layet of Rebound, cutbout foam pieces and coat them in Rebound 25.
Let Rebound dry/cure.
Coat Renound in mold release.
Next, get a hoola hoop or something like that, with a circumference that spans the open/back part of your cast. Use FreeForm air or Plaster o Paris to make a hard outer mold in ATLEAST 2 detachable parts.
You dont want to make a hard outer mold that you cannot pop off!!
Cover the hula hoop with plastic wrap or cheapo plastic bag and only surround it half way around with FreeForm or Plaster.
If you can, make the center of the hard mold round.
After plaster or FreForm cures/hardens yiu are ready to pour.
Pour and use hula hoop and round center to move the piece around.
Viola!
You can make a rubber open mold and cast your part in fiberglass. Then your part will be thin and strong. You can also make a two part mold as mentioned. If your pattern is solid or one sided and you need a consistent wall thickness, you can mold the hero side of your pattern, then take out the pattern. Before you pour in rubber for the second half you can lay in sheet wax to get a consistent thickness.
