Help with Burning Gundam Helmet horns/fins

[Alpha Proto]

I have sculpted a Burning Gundam helmet in oil based clay.

I plan on casting and molding a resin copy to sand and refine details at a later time.

How should I go about making the horns?
I figure they will have to be made separate and added later.
I attempted making them with clay, but they were too heavy to stay on the sculpt. I even scaled the size down and it still wont hold.

 

[Pobbrett]

you could either wire reinforce the clay or make them from another lightweight material such as styrene

 

[NeonHybrid]

I would go with styrene as it's a much better material for the shape than clay will be.

 

[Amish Trooper]

Maybe get some of that green floral foam blocks used in plants and carve to shape then cover in a type of plaster mud-roc bandages for strength.

 

[BATS]

if these are done in clay or wax you'll need it to be a hard clay, then you can shape it to have very very true angles

if you go the route of styrene you'll still need to sculpt a little because of the thickness and because of the mix of soft geometry in these..... so sculpting again either with hard clay/wax or bondo,sculpty that can be sanded after hardening

 

[Alpha Proto]

Can you sand and mold styrene?

 

[NeonHybrid]

You could sand it to shape but if you're planning on doing that acrylic sheet and car body filler are better. You can't use body filler on styrene as it flakes off but you could make a rough mould out of styrene and fill it with body filler then clean it up after taking off the styrene.