Real Renovation Questions: Can X-Bond Microcement Work on These Surfaces?
One of the biggest advantages of microcement is its ability to transform existing surfaces without necessarily removing what's underneath. But that doesn't mean every surface is automatically suitable for resurfacing.
At SEMCO Surfaces, we regularly hear from homeowners, renovators and contractors working with unusual substrates, older buildings and existing finishes that aren't always straightforward to restore.
Every month, we receive hundred of inquiries from client considering applying X-Bond Microcement over everything from century-old plaster to epoxy flooring and exterior stucco. Here are five of the most interesting questions we received in October about X-Bond resurfacing.
Next, explore how microcement adhesion works in resurfacing projects.
1. Can Microcement Be Applied Over a Fiberglass or Acrylic Shower Surround?
Yes! Aside from tiles, X-Bond Microcement can also be applied over prefabricated shower surrounds. However, there are some considerations before undertaking these projects.
Proper surface preparation is particularly important to achieve adhesion on such a smooth surface — involving a primer and scratch coat.
Another consideration is the stability of the material. Fiberglass and acrylic can have some flexibility, so the surface needs to be adequately supported and free from excessive movement before applying a cementitious overlay. Depending on the condition of the substrate, additional preparation measures may include reinforcement mesh or an anti-fracture membrane.
As with any wet area resurfacing project, the appropriate waterproofing and sealing system must also be used.
The takeaway: X-Bond can be used to resurface fiberglass and acrylic shower surrounds, provided the substrate is stable and the correct installation system is followed. This makes it possible to achieve a seamless new finish without necessarily replacing the existing shower enclosure.
Read Next: Why Microcement Showers Are The Best Bathroom Upgrade
2. Can Microcement Be Installed Over Cracked 100-Year-Old Walls?
We recently received a question from someone renovating a 100+ year-old home with traditional plaster. The walls had developed numerous cracks, and the homeowner wanted to know whether X-Bond could cover them and prevent them from returning. This is an important discussion to have with your contractor when working with older buildings.
Whether microcement can be applied over a cracked substrate depends on the cause of the cracking. On an older plaster wall, it's important to determine whether the cracks are the result of deteriorating plaster, poor adhesion to the underlying surface, or ongoing movement within the wall itself.
If the plaster is losing its bond, loose or deteriorating sections will need to be removed before applying a new finish. Cracking caused by structural movement is more complicated. Microcement doesn't automatically stabilise the material underneath, and if that movement continues, cracks may eventually transfer through to the new surface.
Before specifying X-Bond for an older plaster wall, the condition and adhesion of the existing plaster should be assessed, along with the cause and extent of the cracking. Depending on the findings, repairs or additional substrate preparation may be required.
The takeaway: The age of a wall doesn't necessarily rule out microcement, but existing cracks need to be properly assessed. X-Bond is a surface finish, not a structural repair solution.
Read Next: The Importance of Anti-Fracture Membranes in Microcement Systems
3. Does Existing Epoxy Flooring Need to Be Ground Back Before Applying Microcement?
This is another question we've received from customers looking to update existing floors without removing the entire flooring system — and clients are right to ask it. Unlike bare concrete, which can provide a receptive surface without much preparation required, an existing epoxy coating generally needs mechanical abrasion before a new overlay can be installed.
There are also other questions to consider about the existing epoxy coating:
Is the epoxy firmly bonded to the concrete underneath?
Are there areas of peeling, bubbling or delamination — and what is causing them?
Has the surface been exposed to oils, chemicals or other contaminants?
It's worth remembering that the new microcement surface will ultimately depend on the integrity of the layers underneath it. Even excellent adhesion between X-Bond and the epoxy won't compensate for an epoxy coating that's already separating from the concrete under it.
The takeaway: Existing epoxy flooring often will require mechanical abrasion. Whether it can remain in place also depends on its condition and adhesion to the underlying substrate.
Read Next: How Polymer Modification Enhances X-Bond’s Adhesion
4. Can X-Bond Be Applied Over Stucco on an Exterior Retaining Wall?
Stucco and other cement-based renders are common exterior finishes, particularly across warmer regions of the United States.
We recently received a question about applying X-Bond over existing stucco on a retaining wall. While exterior stucco may appear to be a straightforward resurfacing application, retaining walls introduce some additional considerations.
Unlike a typical exterior facade, retaining walls may be exposed to significant moisture from the soil behind them.
If water is entering through the wall, a new surface coating won't necessarily solve the underlying problem. Hydrostatic pressure, inadequate drainage and moisture migration can all affect the performance of an exterior finish. This is why SEMCO's Liquid Membrane plays an important role in the X-Bond waterproofing system, creating a waterproof barrier beneath the microcement finish to help protect against moisture intrusion from both positive and negative sides of the substrate.
The condition of the stucco itself also matters. Older render can sometimes appear sound while having areas of poor adhesion underneath. As we've mentioned, any loose, hollow or deteriorating sections need to be identified and repaired before resurfacing. Rough or heavily textured areas may also need to be mechanically ground down to create a more even, stable surface for the X-Bond application.
For a retaining wall, contractors should pay particular attention to:
Drainage and moisture conditions behind the wall.
Existing cracking or signs of structural movement.
The adhesion and condition of the stucco.
The suitability of the proposed waterproofing and finishing system.
X-Bond is UV-stable and can be specified for suitable exterior applications, but those performance characteristics don't eliminate the need to address moisture or substrate defects.
The takeaway: Resurfacing exterior stucco is certainly possible, but retaining walls require particular attention to drainage, moisture and the condition of the underlying structure.
Read Next: Exterior Masonry Resurfacing With Microcement
5. What Happens if There's Hidden Mold or Moisture Behind the Surface You're Resurfacing?
One of the more open-eded questions we've received recently concerns the possibility of mold behind existing drywall. If you're planning to apply microcement over an existing surface, how do you know what's happening underneath?
Moisture damage can develop behind drywall, tiles, render and other finishes, particularly where plumbing leaks, failed waterproofing or water intrusion have gone undetected. Some warning signs include staining, persistent musty odors, soft or deteriorating materials, bubbling paint and recurring mold growth. However, moisture problems aren't always visible.
Where there is reason to suspect concealed moisture or mold, further investigation may be required before resurfacing — which is why engaging a professional is recommended.
For wet-area projects, it's important to distinguish between the decorative finish and the waterproofing system. X-Bond can be installed in conjunction with SEMCO's Liquid Membrane waterproofing system, which is applied beneath the microcement to create a protective barrier against moisture intrusion. However, existing leaks, drainage issues and underlying moisture damage must still be properly addressed before application.
The takeaway: Microcement shouldn't be used to cover unresolved mold or moisture damage. The underlying issue needs to be identified and addressed before installing a new finish. SEMCO's Liquid Membrane can be used to address certain waterproofing challenges, including moisture intrusion through suitable substrates, but existing mold, leaks and underlying damage must be properly remediated before application.
Read Next:
The Most Important Part of Resurfacing Happens Before the Microcement Is Applied
If there's one thing these questions have in common, it's that successful resurfacing depends heavily on what happens before the first layer of microcement is applied.
X-Bond is a thin, polymer-modified microcement system designed to create durable, seamless finishes across a range of suitable substrates. However, the condition, stability and preparation of the existing surface are critical to its performance.
For applicators, this means assessing the specific project requirement rather than assuming that a material suitable for one application will perform the same way in another.
At SEMCO Surfaces, we've spent more than 30 years developing surface solutions for residential and commercial environments. We work with applicators to help them understand our products, preparation requirements and complete installation systems — contact our team to discuss your application.