Rectangle Cubic 20mm Deep Casting Mould (4" x 2")

The Rectangle Cubic 20mm Deep Casting Mould (4" x 2") is a sturdy silicone mould designed for thick epoxy and resin pours. With a generous 20mm depth, it gives you enough room to embed dried flowers, glitter, foils, or layered pigments — making it ideal for paperweights, decorative blocks, coasters, and small display pieces.

Made from flexible, non-stick silicone, this mould releases cured resin cleanly without the need for mould-release spray. The smooth interior walls ensure a glossy, polished finish on all four sides, reducing the time you spend sanding or finishing your cast pieces. A reliable choice for both beginners and experienced resin artists working on home décor or small-batch craft products.

• 20mm deep cavity — perfect for thick pours, embedments, and layered resin art
• 4" x 2" rectangle shape — versatile size for paperweights, coasters, and decorative blocks
• Flexible silicone construction — cured resin pops out easily with no tearing or sticking
• Smooth interior walls — delivers a glossy, near-finished surface straight from the mould
• Reusable and durable — withstands repeated casting cycles without warping or losing shape
• Compatible with epoxy, UV, and polyester resins — works with most resin types used in craft projects
• Great for embedments — fits dried flowers, charms, foils, and pigment layers comfortably

How to Use

Lightly dust the mould with talc or a mould-release spray if desired (not mandatory). Mix your epoxy or casting resin as per the manufacturer's ratio, pour slowly to avoid bubbles, and use a heat gun or torch to pop surface bubbles. Allow to cure fully before demoulding — flex the mould gently from the edges to release the piece.

Safety Tips

Always work in a well-ventilated area when handling uncured resin. Wear nitrile gloves and safety glasses during mixing and pouring. Keep resin and mould away from children. Do not use this mould in a microwave or conventional oven.