Underhill Casting HDPE Bottom Disc for Pressure Pots

Create a perfectly flat casting surface inside your pressure pot with the Underhill Casting HDPE Bottom Disc. Designed specifically for most 2.5-gallon pressure pots, this durable high-density polyethylene (HDPE) disc provides a smooth, level foundation for your molds while making resin cleanup incredibly easy.

Unlike metal surfaces that can collect cured resin and become difficult to clean, the non-stick HDPE surface allows cured epoxy and urethane resin to simply pop right off, saving time between casting sessions. The disc also helps compensate for the slight concave shape found in many pressure pots, giving your molds a more level surface for improved casting consistency.

Whether you're casting pen blanks, knife scales, turning blocks, or other resin projects, this simple upgrade helps protect your pressure pot while improving your casting workflow.

Features & Highlights

• Designed for most 2.5-Gallon Pressure Pots
• Creates a flat, level casting surface
• Non-stick HDPE allows cured resin to release easily
• Helps compensate for the concave bottom found in many pressure pots
• Protects the bottom of your pressure pot from resin spills
• Durable, reusable, and easy to clean
• Convenient 1" finger hole for quick removal
• Compatible with virtually all mold and rack configurations

Perfect For

• Pen Blank Casting
• Knife Scale Casting
• Resin turning blanks
• Small casting molds
• Silicone mold systems
• Pressure casting epoxy and urethane resins

Specifications

• Material: High-Density Polyethylene (HDPE)
• Pot Size: Most 2.5 Gallon Pressure Pots
• Diameter: Approximately 9"
• Thickness: 1/8"
• Center Hole: 1" Finger Hole
• Reusable: Yes
• Sold: Per Disc

Why Choose HDPE?

HDPE is one of the best materials available for resin casting accessories because cured resin bonds very poorly to its surface. Instead of scraping hardened resin from the bottom of your pressure pot, cured drips and spills simply release with minimal effort, making cleanup faster and extending the life of your equipment.

The rigid disc also provides a more stable foundation for molds by leveling uneven pot bottoms, helping produce more consistent castings.

Helpful Tips

• Place the disc directly on the bottom of your pressure pot before loading molds.
• For large or especially heavy resin pours, consider stacking two discs for additional rigidity.
• Alternatively, a base of dry rice beneath the disc can provide extra support while maintaining a level surface
• After casting, simply remove the disc using the center finger hole and peel away any cured resin.

Why You'll Love It

The Underhill Casting HDPE Bottom Disc is one of those simple shop upgrades that quickly becomes indispensable. It keeps your pressure pot cleaner, provides a flatter casting surface, reduces cleanup time, and helps protect your investment—all while making every casting session a little easier.