Imagine stepping into a spa-like bathroom where every surface gleams with sophistication. You run your hand across the silky finish of the wall and wonder: Is this polished plaster really waterproof? This is where the truth comes in: Polished plaster is not waterproof. And while sealers can help, there are better, smarter solutions for modern wet spaces, let’s unpack the truth.
TOPCRET
8-9 minutes time reading
Polished plaster is a decorative wall finish made from lime, marble dust, and other natural materials. It’s known for its glossy, mirror-like sheen and has been used for centuries in luxurious interiors.
Artisans apply it in thin layers using a trowel, then polish it to achieve that smooth, marble-like appearance. It looks stunning, no doubt, but it’s the inside that counts when we talk about waterproofing.
You’ll find it in high-end bathrooms, foyers, and feature walls. Designers love it for its elegance and timeless appeal. But when it comes to moisture-prone areas, its performance becomes questionable.
Waterproof means water can’t get in, ever. Water-resistant? It’ll hold up for a bit, but eventually, water wins. It’s like comparing a raincoat to a wool jumper sprayed with waterproofing spray.
Polished plaster is not waterproof. Unless treated with sealers, polished plaster is porous. That means water seeps in over time, potentially leading to dark stains, mould, and damage beneath the surface.
Picture this: You splash your shower wall daily. Within weeks, the once-gorgeous plaster might darken or even deteriorate. Not ideal, right?
Bathrooms naturally generate steam, humidity, and splashes. Polished plaster can’t withstand that without help — and even then, the help is temporary.
These are danger zones for polished plaster. Constant exposure to water is simply more than it can handle.
You can apply wax or resin-based sealers to create a water-resistant barrier. This helps with cleaning and short-term protection.
But here’s the catch: even sealed, it’s not truly waterproof. Over time, water can still penetrate, especially in high-moisture or high-traffic environments. It’s a bit like putting a plaster on a leaky pipe.
Clay is a next-gen clay-based wall finish by Topcret. It brings together natural beauty, artisan textures, and, crucially, true waterproofing thanks to the Hydro+ system.
Hydro+ is an advanced formula that makes Clay® completely waterproof before sealing. That’s a big deal.
Unlike surface-only solutions, Clay has waterproofing built into the structure. You get full peace of mind even in the wettest environments.
Even while blocking water, Clay® lets walls breathe. It’s free from VOCs, making it safe for families, pets, and the planet.
✅ Waterproof before sealers
✅ Stronger than microcement in wet zones
✅ VOC-free and breathable
✅ Ideal for bathrooms, backsplashes, and spa environments
✅ Four textures (S, M, L, XL) and 60+ colour options
With Clay®, you don’t need layers of protection or compromises in style. You get natural elegance with next-generation performance.
Clay® wins. It’s made for wet environments like showers, bathrooms, and spa walls — no sealing required.
With Clay®, forget regular sealing and worrying about stains. It’s ultra-durable, scratch-resistant, and easy to clean.
Polished plaster is shiny and smooth — beautiful, yes. But Clay® offers more: four artisan textures (S, M, L, XL) and over 60 customisable colours.
From showers to steam rooms, Clay® handles moisture like a pro. It’s built for beauty and performance.
Cooking, splashing, and cleaning? No problem. Clay® resists grease and water while looking gorgeous.
Clay is the go-to choice for hotels, spas, and wellness centres — where performance, hygiene, and aesthetics are all non-negotiable.
Let’s face it: polished plaster is beautiful, but when it comes to real-life use in wet areas, it’s just not cut out for the job.
If you want a finish that combines natural beauty, waterproofing, durability, and sustainability, look no further than Clay® by Topcret.
It’s time to stop patching problems and start building smarter.
👉 Ready to transform your walls? Discover Clay® by Topcret and request your quote today.
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