Applying MicroRock Medium

Follow the directions below to apply the MicroRock Medium.

The standard consumption for MicroRock Medium is 5kg for 10m2, one coat.

Expected drying time for MicroRock Medium is 3 hour and there is no limit on how long you can leave it between coats.  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 Medium.

You will need a microcement mixer and a flexible trowel.

Mixing the MicroRock with Comp B

You will need 5kg per 10m2 for 1 coat of MicroRock Medium.

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 1st Coat MicroRock Medium

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.

Getting the Right Effect

The more you trowel over the MicroRock with a steel trowel, the more it will blacken in high spots.  This technique is called “burnishing” and is often used by microcement installers to add depth to their work. You’ll find that MicroRock Stucco Effect burnishes more readliy than MicroRock Continuous Effect. This looks great in grey-scale colours but isn’t always desired in lighter or brighter colours. So if you don’t want black marks, then go for Continuous instead and try not to trowel over the same area more than you need to.

Mixing 2nd Coat MicroRock Medium

Mix thoroughly with a Microcement Mixer Head attachment on a cordless drill to make sure the colour is well distributed.

When you are ready to apply, mix MicroRock 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 the 2nd Coat MicroRock Medium

Again, this coat needs to be applied thinly.  Use exactly the same technique as you did with the 1st coat of MicroRock Medium.

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 220/240 Grit Silicone Carbide Sand Paper

Gently & evenly sand the surface of the microcement with a 220 or 240 grit paper to remove any rough patches and drips. It should be flat from the trowel so you shouldn’t need to sand it too much at this stage.

Don’t sand in one area for too long as it can cause the MicroRock to polish up to a white spot.

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.