How to Mix Epoxy Putty Accurately for Maximum Strength

Q: Understanding Epoxy Putty Mixing Ratios

Epoxy putties, such as Magelstick Epoxy Mastic , are typically two-part systems. Each component must be combined in the correct ratio, which for Magelstick is 100:50 by weight (resin to hardener). Using digital scales is highly recommended for precise measurements, as even small deviations can affect the final strength. Always check the manufacturer’s instructions for the exact ratio. Prepare enough material to work within the product’s open time to avoid premature curing. Mix small batches for detailed or intricate areas to maintain accuracy and prevent waste.

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Mixing Epoxy Putty Accurately for Strength

When grouting floors with epoxy putty, accurate mixing is crucial to achieve the best possible strength and durability. Proper technique helps prevent weak spots and ensures a robust, long-lasting finish.

Understanding Epoxy Putty Mixing Ratios

Epoxy putties, such as Magelstick Epoxy Mastic, are typically two-part systems. Each component must be combined in the correct ratio, which for Magelstick is 100:50 by weight (resin to hardener). Using digital scales is highly recommended for precise measurements, as even small deviations can affect the final strength.

Always check the manufacturer’s instructions for the exact ratio.
Prepare enough material to work within the product’s open time to avoid premature curing.
Mix small batches for detailed or intricate areas to maintain accuracy and prevent waste.

Tips for Proper Mixing and Application

Once weighed, thoroughly blend both components until the mixture is completely uniform in colour and texture. Unmixed pockets can remain soft and compromise the bond. Use a robust mixing spatula or trowel and scrape the sides and bottom of your container to incorporate all material. For spreading, a notched spatula—like the Tooth Shaped Spatula—can help achieve even coverage, reducing the chances of weak areas or air bubbles.

Mix only in recommended temperature ranges (typically above 10°C for Magelstick) for full cure strength.
If applying vertically, choose a thixotropic formula to prevent sagging.

When Precise Mixing Matters Most

Accurate mixing is particularly critical for surfaces exposed to heavy wear, temperature changes, or the elements—such as entryways, outdoor steps, or workshop floors. Properly mixed epoxy putty offers high mechanical strength and resistance to weathering, ensuring your grouted joints remain strong and intact over time.

Related guides

How To Grout The Floor With Epoxy Putty

By taking care to measure and mix your epoxy putty correctly, you lay the foundation for a reliable and professional-quality floor grout. For further advice on floor grouting techniques using epoxy, see our full guide on how to grout the floor with epoxy putty.