Repairs to Microcement Surfaces
Microcement is notoriously difficult to patch, and almost impossible to do seamlessly.
Ideally, complete & test all first fix plumbing & electrical work before starting the microcement & do a dummy run with fiixtures & furniture. This will help to avoid the need for repair work.
Of course, accidents do happen & occasionally you might need to complete larger repairs to the microcement surface. Here’s our guide to repairing damages in this instance.
Fill Voids & Prepare the Area
Microcement will need a solid surface to adhere to, so before you begin the repair, fill any voids so that the surfaces are completely flat & stable. If you have replaced sections of plaster board or cement board, it will need flushing out with a suitable filler so that the surface is completely flat.
Remove any loose material and make sure the area that you are going to repair is clean, dry and free from dust and debris. You can tidy up rough edges by gently sanding them (try a 120 or 220 grit).
Prime & Mesh
Use Primer 100 over the area to be repaired. If there are joins in the surface, then use Fibreglass Mesh to bridge the joins & add strength to the surface.
This guide explains the full process for applying Primer 100 & Mesh:
Applying Primer 100 & Fibreglass Mesh
Level the Surface with Microcement Base Coat
Level the surface with microcement base coat, until the void is the same depth as the rest of the microcement surface.
Apply the base coat in several thin coats rather than one thick coat. You may need to complete 2-3 coats of microcement to achieve the correct level.
Mix and apply the base coat according to the relevant Product Installation Guide.
Recoat Across the Entire Surface
Once the base coat is completely dry and flat, so that both the repaired area is completely flush with the surrounding surface, you can start to apply the final coats.
Follow the guide below to complete the recoat across the entire surface:
Recoating Microcement Surfaces
To get a seamless surface, you will need to reapply the top coats across an entire surface up to the external edges of that surface e.g. a wall up to the internal corners of that wall.
There may be a slight colour difference, but if you work up to the corners, you should find that it generally blends well with the surrounding surfaces.
Tape up & cover down adjoining surface & take care not to allow excess products to build up in the corners.
What if I Don’t Have Enough Products Left?
We sell all the products individually, so you only have to buy the items that you need to finish the job. Please feel free to get in touch if you would like us to help work out quantities.
Leave to Dry
Leave for at least 48 hours. Light use only for the first 14 days. For more information on caring for your microcement surface, visit the guide below: