: The industry standard for mold-making and casting. They offer popular products like Mold Star 20T , which is great for beginners because it doesn't require a vacuum chamber.

: Specializes in industrial silicone products, including sheets, sponge strips, tubing, and adhesives.

If you need extra-deep molds (often used for "deep pours" of resin, floral preservation, or bookends), these retailers have specialized inventory: