How to use SUMO Sumoxy Epoxy Tile Grout (2K & 3K)
The correct way to mix and apply SUMO Sumoxy 2K and 3K epoxy tile grout for a hard, stain-proof, fully-cured joint.
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Epoxy grout only performs if it is mixed correctly. Too little hardener and it stays soft; poor blending leaves streaky, tacky patches; too big a batch sets before you have used it. SUMO Sumoxy 2K is a two-part (resin + hardener) and 3K a three-part (resin + hardener + filler) reactive grout — both reward a careful, disciplined mix.
What you’ll need
Step by step
Use the full kit ratio
Epoxy grout is supplied as matched parts — combine the complete parts in the ratio on the pack. Do not split a kit or eyeball proportions; the ratio is what makes it cure hard.
Add hardener to resin, then filler (3K)
Pour the hardener into the resin and blend, then (for 3K) add the filler gradually while mixing. Adding filler slowly avoids lumps.
Mix to a completely uniform colour
Mix slowly and scrape the sides and bottom until the colour is totally even with no streaks. Streaks are unmixed hardener — they become soft, tacky spots in the joint.
Mix a batch you can use in time
Epoxy sets by reaction, faster in heat, and cannot be revived with water. Mix only what you will apply within the pot life, then mix the next batch.
Care, tips & what to avoid
- !Wrong ratio / part-mixing a kitThe parts are matched. Using the wrong proportion leaves the grout soft or brittle. Mix the full kit.
- !Under-mixingStreaks are unmixed hardener → soft, tacky spots. Mix to a uniform colour and scrape the sides.
- !Mixing too muchEpoxy has a short pot life and sets in the bucket. Mix small, use it, mix again.
- !Trying to thin with waterWater does not slow or thin reactive epoxy — it just ruins it. Never add water.
