When you're behind the wheel of a quarter midget, comfort, control, and safety are inseparable. A seat that doesn’t perfectly conform to your body can leave you shifting under load, increasing fatigue, or worse, compromising your support in a crash. That’s why we at VAST Racing Products are proud to offer the E-Z Sert Urethane Seat Insert Pour Kit – small size — the ideal solution for youth-class drivers seeking a custom fit inside their existing seat shells.
You can view the product page here: E-Z Sert Urethane Seat Insert Pour Kit
(Note: We only stock the small kit — this size is sufficient for most quarter midget seats, covering hips, thighs, pelvis, and lower back.)
What Is the E-Z Sert Pour Kit and Why It Matters
The E-Z Sert system, from ButlerBuilt, is a pour-foam insert kit that allows you to create a custom, contoured urethane shell that matches your body shape inside your existing seat. The kit includes flame-retardant fabric (MaxGard upholstery), mixing hardware, foam resin, and full step-by-step instructions.
Key benefits include:
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Better fit, better control: By molding directly to your body, the foam insert helps minimize shifting under lateral, braking, or impact loads.
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Improved comfort and reduced fatigue: The molded foam spreads forces over a larger area and absorbs vibration.
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Enhanced safety: A tight fit keeps you more firmly in place during hard maneuvers and crash events.
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Cost-effective over full custom shells: You can retrofit your existing shell instead of buying an entirely new seat.
How to Use the E-Z Sert Small Kit: Step by Step
Below is a rough outline of the process. Always follow the instructions included in your kit.
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Prepare the shell & your body
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Install any rib foam or padding as needed (especially for lower ribs)
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Clean and mask off areas inside the seat shell that you don’t want foam (e.g. holes, rails, harness slots)
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Fit a stock foam “backing”
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Use a light foam backing (polyurethane foam or soft foam sheet) against your body inside the shell to form the “compression layer.”
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Position yourself in driving posture (helmet, gear, belts) so the molded insert will reflect the true driving position.
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Mix the urethane resin components
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The kit comes with two (or more) parts to mix. Follow the exact ratios and stir thoroughly.
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Use a clean, measured container. Work promptly — the reaction can accelerate once mixed.
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Pour the resin
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Pour into the cavity between your body + backing foam and the hard shell walls. Start with lower areas and let the foam rise gradually.
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Be mindful of overflow points and venting.
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Cure and demold
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Let the foam cure per kit instructions (often several hours or overnight).
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Remove from shell carefully — trim excess, smooth transitions, and cut harness slots as needed.
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Test fit & fine tune
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Try your molded seat to confirm comfort, belt alignment, ventilation, and ingress/egress.
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You may need small adjustments (sanding, minor trimming, adding foam patches).
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Tips & Best Practices (Especially for Quarter Midget Use)
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Practice on a test mold first: If this is your first pour, try a small portion or mock cavity to get familiar with cure times and behavior.
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Control ambient temperature: Foam reaction times and expansion are temperature sensitive. Too warm, and the reaction can be too fast.
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Mask well: Use strong tape or barrier layers over bolt holes, mounting points, and tricky edges.
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Vent carefully: Avoid trapping bubbles or voids by allowing foam to vent naturally toward filled areas.
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Wear safety gear: Use gloves, respirator or good ventilation, and eye protection when mixing and pouring.
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Allow full cure: Don’t rush demolding or test fitting before the recommended cure time.
Why Every Youth Racer Should Consider This Upgrade
A well-fitted seat is more than comfort — it’s a tool. As you push harder, knowing that your body is locked precisely where you want it aids consistency and confidence. In youth racing, where every fraction counts, having that extra edge matters.
Because we only offer the small kit (perfect for quarter midget shells), you won’t pay for unnecessary oversize materials or waste. Order yours today: E-Z Sert Urethane Seat Insert Pour Kit – small
Let us help you get into a seat that’s truly yours — tighter, softer, safer.