How Important Is the Mixing Ratio for Epoxy Cement?

Why Mixing Ratios Matter

Epoxy cement relies on a precise chemical reaction between two components: resin and hardener. Using the correct proportion is vital for full curing; too much or too little hardener can result in weak adhesion, incomplete hardening, or even surface tackiness. This is particularly true of specialised products such as Magelstick Epoxy Mastic, which specifies a 100:50 ratio by weight of epoxy to hardener for reliable results.

Tips for Accurate Mixing

To achieve the intended performance of your epoxy cement, always refer to the manufacturer’s instructions. Use accurate digital scales for measuring parts by weight, and mix thoroughly to ensure complete blending. For two-part kits like Magelstick, prepare only as much as needed for immediate use, as epoxy mixtures begin to cure once combined. Maintain a workspace above 10°C to promote proper curing and consistency.

When This Matters Most

• Structural or exterior repairs: Where strength and weather resistance are critical.
• Vertical or decorative surfaces: Epoxy with specific ratios (such as thixotropic products) prevent sagging and provide reliable finishes.
• Restoration or grouting stone and cement: Correct ratios ensure lasting repairs without premature breakdown.