Materials needed to make polymer clay molds:

• Scrap clay, well conditioned (use a firm clay, like Kato)
• Tissue blade, sharp
• Talcum powder or cornstarch
• Soft paintbrush
• Small ceramic tile
• Acrylic block (optional)
• Small container with cold water
• Selection of buttons and charms

[Source: http://craftartedu.com/polymer-clay/polymer-clay-free-classes/debbie-crothers-making-molds] a

Use Kato Poly Paste to secure polymer clay forms.

What is Poly Paste?

Poly Paste is polymer clay in a sticky, paste form. As other polymer products, it requires heat to cure.

Poly Paste does not melt or run, making it ideal as a gap filler.

The stickiness of the Poly Paste makes it ideal for bonding odd shaped cured clay pieces or bonding when the two objects are precariously placed. It will grab and hold through the curing process.

[Source: http://craftartedu.com/polymer-clay/free-product-tutorial/kato-polyclay-tutorial]