How to Make Custom Rubber O-Rings - The Ultimate Guide

Author: Madeline Brennan
Date posted: 26 February 2026

Using Weicon VA 30 Black Rubber-Filled Super Glue & Gaskaseal O-Ring Cord

In industrial maintenance, repairs, and equipment design, off-the-shelf O-rings aren’t always the solution. Whether the size is non-standard, the material needs to meet specific chemical or temperature resistance requirements, or there's simply no time to wait, the ability to create custom O-rings from cord stock is invaluable.

This guide explains how to make strong, reliable rubber O-rings on-site using Gaskaseal rubber O-ring cord, Weicon VA 30 Black Rubber-Filled Super Glue, and Weicon Surface Cleaner a fast, proven method for static sealing applications.

What You'll Need

All products are available from Swift Supplies Australia:

Step 1: Measure the Required Cord Length

To calculate how much cord you'll need to form the O-ring, use the formula:

Cord Length = (O-Ring ID + (Cord Diameter × 0.5)) × π

This accounts for slight compression once the O-ring is in service.

Expert Tip: Use a digital caliper for accuracy. A miscut O-ring, even by a millimeter, can compromise sealing performance.

Step 2: Cut the Cord at an Angle

Make a clean, angled cut, typically 45 degrees on both ends of the cord. This increases the surface area for bonding and results in a stronger, more durable seal.

For best results, use a cutting jig or mitre guide to ensure a consistent, flush join.

Step 3: Clean the Ends with Weicon Surface Cleaner

Spray the freshly cut cord ends with Weicon Surface Cleaner and wipe dry with a clean, lint-free cloth. This step removes oils, dust, and mold-release agents that can interfere with bonding.

Clean bonding surfaces are essential; contamination significantly weakens adhesive performance.

Step 4: Apply Weicon VA 30 Adhesive

Apply a thin, even film of Weicon VA 30 Black Rubber-Filled Super Glue to one of the cut faces. Carefully align the ends and press them together firmly for 20–30 seconds.

Weicon VA 30 is a specialist-grade adhesive designed for bonding rubber. It contains rubber particles that increase joint flexibility and impact resistance perfect for sealing applications.

Step 5: Allow the O-Ring to Cure

Initial bonding occurs quickly, but for best results:

  • Minimum cure time before installation: 15–30 minutes

  • Full cure time for maximum strength and chemical resistance: 24 hours

Always allow full cure time before using the O-ring in critical or high-pressure environments.

Application Guidelines

  • This method is recommended for static seals only (e.g., flanges, enclosures). It is not suitable for dynamic or rotary shaft applications.

  • Select the appropriate Gaskaseal cord material based on chemical exposure, pressure, and operating temperature.

  • Store unused cord and adhesives in a cool, dry environment to maintain material integrity.

  • If the seal is mission-critical, perform a pressure test after curing to validate the joint.

Why Use Weicon VA 30?

  • Rubber-filled formula for added elasticity and shock resistance

  • Medium viscosity for precise, drip-free application

  • Ideal for bonding NBR, Viton, EPDM Sponge, and other elastomers

  • Creates long-lasting, industrial-grade joins

Weicon adhesives are trusted by professionals worldwide for rubber bonding and precision sealing applications.

Final Thoughts

Making your own O-rings using Gaskaseal cord and Weicon adhesives is a reliable, cost-effective alternative to custom-manufactured rings. Whether you're in a workshop, remote job site, or production line, this method allows you to stay in control, reduce downtime, and achieve high-quality results in minutes.

Need help selecting the right cord or adhesive for your application?
Our technical team at Swift Supplies is here to assist contact us today.

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