{"id":1909,"date":"2024-11-22T15:51:38","date_gmt":"2024-11-22T15:51:38","guid":{"rendered":"https:\/\/www.refina.co.uk\/blog\/?p=1909"},"modified":"2024-11-22T15:51:40","modified_gmt":"2024-11-22T15:51:40","slug":"surface-preparation-for-different-types-of-plaster-gypsum-lime-and-cement","status":"publish","type":"post","link":"https:\/\/www.refina.co.uk\/blog\/2024\/11\/22\/surface-preparation-for-different-types-of-plaster-gypsum-lime-and-cement\/","title":{"rendered":"Surface Preparation for Different Types of Plaster: Gypsum, Lime, and Cement"},"content":{"rendered":"\t\t
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Surface preparation is an essential yet often overlooked stage in any plastering project. Whether you\u2019re working with gypsum, lime, or cement plaster, how well you prepare the surface can determine the final quality and durability of your work. Each type of plaster has unique requirements when it comes to surface preparation. By using the right tools and techniques, you can ensure proper adhesion, even drying, and a flawless finish.<\/span><\/p>

In this guide, we\u2019ll walk you through the key steps of surface preparation for each type of plaster, incorporating REFINA\u2019s premium tools to make the process more efficient and professional.<\/span><\/p>\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Why Surface Preparation is Critical\n<\/h2>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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Surface preparation is about creating the perfect canvas for plaster application. Without thorough preparation, even the highest quality plaster can fail, leading to issues like poor adhesion, cracking, and uneven surfaces. The ultimate goal of surface preparation is to ensure that the plaster bonds well to the substrate and that the surface remains smooth and stable throughout its life. Different types of plaster\u2014gypsum, lime, and cement\u2014require specific preparation steps to accommodate their unique properties. Using specialised tools from REFINA can simplify the process, making it easier to achieve professional-level results.<\/span><\/p>\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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How to Prepare Gypsum Plaster Surfaces\n<\/h2>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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Gypsum plaster is a quick-setting material made from gypsum, a naturally occurring mineral composed of calcium sulfate dihydrate. When mixed with water, sand, and other additives, it forms a paste that can be easily applied to walls and ceilings, enhancing surface quality. In the UK, multi-finish plaster is the most popular type of gypsum plaster, valued for delivering high-quality finishes across a wide range of plastering applications.<\/span><\/p>

Once fully cured, gypsum plaster creates a tough, durable surface that resists cracking and withstands light wear. As a gypsum-based product, multi-finish plaster also boasts excellent moisture-regulating properties, allowing walls to “breathe” and reducing condensation, which helps maintain a healthy indoor environment. To ensure proper adhesion and even drying, it’s important to thoroughly clean and prime the surface and control moisture levels during application.<\/span><\/p>\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Step 1: Surface Cleaning<\/strong><\/h3>

The first step in preparing a wall for gypsum plaster is to ensure the surface is clean and free of any dust, grease, or loose particles. Even small contaminants can prevent the plaster from bonding effectively, leading to surface imperfections.<\/span><\/p>

For this task, a render scraper or wire brush is ideal. REFINA’s <\/span>sharp-toothed scrapers<\/span><\/a> are specifically designed for efficient surface removal, while wire brushes are excellent for eliminating old mortar, plaster, and paint.<\/span><\/p>

The precise scraping action creates an optimal texture for the base coat, improving the adhesion of topcoats or finishes. This ensures a long-lasting, professional-grade result.<\/span><\/p>\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Step 2: Priming with PVA and Bonding Agents<\/b><\/h3>

Priming is a crucial step, particularly when applying gypsum plaster to porous surfaces like brick or blockwork. Applying a PVA solution seals the substrate, preventing it from absorbing moisture too quickly from the plaster. This ensures that the plaster sets evenly and remains bonded to the surface. Use a <\/span>REFINA Premium Water Brush<\/span><\/a> to apply the PVA solution evenly across the wall. This high-quality brush allows for smooth, streak-free application, making sure the primer reaches every part of the surface, especially on rough or uneven textures.<\/span><\/p>

We recommend using SBR (Styrene Butadiene Rubber), an additive that boosts the performance and durability of plaster. It enhances adhesion, ensuring the plaster bonds effectively to difficult surfaces such as smooth concrete or old masonry. SBR also improves water resistance, minimises the risk of cracking, and adds flexibility, helping the plaster withstand movement or shrinkage.<\/span><\/p>

SBR can be applied as a primer or mixed with cement as a bonding agent, reinforcing the bond between plaster layers for a longer-lasting and more durable finish. Furthermore, on high-suction surfaces, particularly dry substrates, using SBR (Styrene-Butadiene Rubber) as a bonding agent is highly effective in reducing suction.<\/span><\/p>

A bonding agent may be necessary in cases where the surface is particularly smooth or non-porous, such as concrete. This enhances the adhesion between the plaster and the substrate, preventing peeling or cracking after drying.<\/span><\/p>\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Sharp Toothed Scrapers<\/span><\/a><\/h4>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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8mm sharp & twisted
10″ render scrapers
Blue grip & stainless steel prongs<\/p>\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Premium Water Brushes<\/span><\/a><\/h4>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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4″ – 7″ water brushes<\/span>
3 bristle options available<\/span><\/span>
Excellent water retention<\/span><\/span><\/p>\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Step 3: Dampening the Surface<\/b><\/h3>

Gypsum plaster should not be applied to a dry surface as it will absorb water from the plaster too quickly, causing cracking. Lightly spray water on the wall using a misting spray bottle or a sponge. The surface should be damp but not saturated with water.<\/span><\/p>

However, please note that this step isn\u2019t required if you\u2019re applying Gypsum plaster to plasterboard.<\/span><\/p>\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Step 4: Application of Gypsum Plaster<\/b><\/h3>

After the surface is prepped and primed, it’s time to apply the gypsum plaster. For a professional finish, we recommend using REFINA\u00a0FINATEX-1 laying on trowels<\/a>\u00a0for the first coat. These trowels are designed with a 0.65mm stainless steel blade and machine-chamfered side edges, ensuring exceptional precision and quality throughout the application process.<\/p>

After applying the first coat, it’s important to level the plaster. There are various trowels to use for this process:<\/p>