Epoxy grout is a multi-part product. You mix it on site from separate components. The maker’s data sheet sets the method for each product. Mixing follows that data sheet.
What the parts are
The LATICRETE FAQ page “Epoxy Grouts” explains the basic structure of the product. Parts A and B are resins. Part C is the filler powder. The LATICRETE FAQ page “Epoxy Grouts” suggests you mix the entire unit for best results. A small batch uses the same proportions of each component by volume, such as half of each part.
How to mix epoxy grout
Work through the steps in order. The order matters because the resins need to blend fully before the powder goes in.
- Blend Parts A and B fully before you add Part C.
- Add at least three quarters of the Part C filler powder to the blended resins.
- Adjust the consistency during mixing.
- Use all of the Part C powder for optimum grout coverage.
For narrow joints or easier workability you can use 10% less powder, which lowers coverage by the same amount. Consistency is adjustable during mixing. If bubbles in a resin mix are a concern for you, the guide on mixing epoxy without bubbles covers related mixing.
Mix the entire unit. For a small batch, use the same proportions of each component by volume.
How much working time you have
Working time depends on the product and the room temperature. The LATICRETE FAQ page “Epoxy Grouts” gives approximately 80 minutes of working time for SPECTRALOCK PRO Premium and SPECTRALOCK 2000 IG. That figure applies at 70 degrees Fahrenheit. Higher or lower temperatures affect working time.
Can you add water or thin it
The LATICRETE FAQ page “Epoxy Grouts” does not address adding water or other products. Check the product data sheet or contact LATICRETE before you change the mix. Do not add water or other additives unless the data sheet says so. If you are comparing product families, the post on Mapei Flex Color CQ looks at how one ready-to-use product fits the wider epoxy grout picture.
Slow mixer or hand mixing
Sika gives you two ways to mix. Use a slow-speed mixer at 300 rpm. Or mix by hand with a margin trowel. Either way, keep it slow. Sika says prolonged mixing traps air and shortens the pot life. So mix just until the parts come together, then stop. This is one maker’s instruction, so your own data sheet rules.
Why you mix complete units
Sika says to always mix complete units. The kit is packaged to ratios for proper curing. Part A is 2 lbs, Part B is 1 lb, and Part C is 10 lbs. Empty all contents of Parts A and B. Scrape the containers with a margin trowel so nothing stays behind. Then add all of Part C, the colored powder. Sika says not to add any other materials to the mixture. Check your own data sheet too.
What the mix should look like
Mix until the product is homogeneous. Sika describes the target as a thick peanut-butter-like consistency. Sika also warns against prolonged mixing. Treat this as one maker’s guidance and check your own data sheet.
Bottom line
Blend the resins first, then add the powder. Use the whole unit when you can. Keep the data sheet close and respect the working window. If you also work with coatings, the guide on hot coating epoxy covers a related mixing routine for resin systems.
FAQ
Can I mix half a unit?
Yes. The LATICRETE FAQ page “Epoxy Grouts” says a small batch can use the same proportions of each component by volume, such as half of each part. Mix the entire unit when you can, because the maker suggests it for best results.
How much powder do I add?
Add at least three quarters of the Part C filler powder to the fully blended A and B resins. Use all of the powder for optimum coverage. For narrow joints you can use a little less powder.
How long do I have to work?
For SPECTRALOCK PRO Premium and SPECTRALOCK 2000 IG, the LATICRETE FAQ page “Epoxy Grouts” gives approximately 80 minutes. That is at 70 degrees Fahrenheit. Temperature changes that window.
Martin Flood
Martin Flood has been working in the construction industry for over 20 years as a general contractor with expertise in remodeling projects that are large or small. He has furthered his career by specializing in epoxy resin flooring, providing excellent service to both commercial and residential clients. Martin’s experience enables him to offer professional advice on how to choose the right type of project based on your needs and budget.
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