Applying MicroRock Coarse

Follow the directions below to apply the MicroRock Coarse.  Unlike MicroRock Medium, you will only apply one coat of MicroRock Coarse.

The standard consumption for MicroRock Coarse is 10kg for 10m2, one coat.

Expected drying time for MicroRock Coarse is 12 hours.  The pot life for MicroRock is 45 minutes – 1 hours, so it’s best to mix it in batches.

Mix 1l Comp B with 10kg MicroRock Coarse.

You will need a microcement mixer and a flexible trowel.

Mixing the MicroRock with Comp B

You will need 10kg per 10m2 for 1 coat of MicroRock Coarse.

Mix the Comp B into the MicroRock at a ratio of 1kg MicroRock : 100ml MicroRock Comp B.

Once mixed, you will have around 45 minutes to work with it, depending on the conditions, so you may want to mix it in smaller batches until you get a feel for it.

Applying MicroRock Coarse

Using a Microcement Trowel, work your way out from one corner creating a random edge pattern. Keep trowel movements small and random, avoid long sweeping arches – as these will show through to your final finish.

Use the grain in the microcement as your level – if you apply the microcement thicker than the size of the grain, the finish won’t be as strong and will require a lot more sanding. Run the trowel back over each section that you have put down to smooth it out and remove excess product.

Completely cover each surface without stopping. For complete rooms, start with ceilings, then walls from left to right (or right to left) and then the floor.

Run your finger or a corner trowel along internal corners to push the microcement into the corner and then gently trowel away the excess product.

Leave to Dry

Drying time will vary depending on temperature and ventilation.  We would expect it to be dry enough to take another of MicroRock within 3 hours.

Sand with 40/80 Grit Silicone Carbide Sand Paper

Once the base coats are dry and before you apply your Top Coats, you need to make sure the Base Coats are completely flat.  You need to use a strong sand paper, like Silicone Carbide, to prevent colour from the disc transfering to your work.

Flatten the MicroRock Base with a 40 or 80 grit sand paper. An orbital sander is ideal, but, for smaller areas, you can do it by hand.

Use the sand paper to remove ridges and drips that have dried in the microcement.

The top coats are very thin so any ridges or imperfections in the base coats will be visible in the top coats.  Take your time to get it completely flat before moving on to the next step.

Vacuum the surface to remove all dust and debris. Do not wet the microcement.

We stock a range of Microcement Sanding Discs on our website.