Sprayable Coarse-Grain Gypsum Primer for Direct Application over Masonry Surfaces

Overview
PPG121 is a polymer-enhanced, coarse-grained gypsum primer designed to be applied using a spray machine. It serves as a reliable base layer over masonry walls, providing high adhesion, good workability, and an ideal surface for finishing coats.

Key Features

• Applied by spraying machine for fast and even coverage

• Strong adhesion to brick or block masonry

• Easy to smooth and adjust after spraying

• Suitable for interior base preparation prior to finishing gypsum layers

Method of Use
Ensure the masonry substrate is clean and free from dust, oil, or other contaminants. Repair any cracks or structural imperfections before application.

Preparation Instructions

• Mix the gypsum powder with clean water in a 2:1 ratio (gypsum to water).

• Use a spraying machine to mix and apply the gypsum.

• Spray the prepared mixture evenly onto the surface.

• After spraying, use a trowel to smooth the surface and adjust thickness.

• Allow the gypsum to dry completely before applying any finishing layers.

Technical Data

• Color: White

• Compressive Strength: Minimum 2.5 MPa

• Initial Setting Time: ~60 minutes

• Final Setting Time: 2–3 hours

• Density: ~0.8 – 0.9 g/cm³

• Chemical Base: Hydrated gypsum with specialized additives

Coarse-Grained Base Layer Plaster for Manual Application on Masonry Surfaces

Overview
PPG513 is a coarse-grained polymer-enhanced gypsum plaster designed for use as a base layer over masonry walls. This product is ideal for manual application, providing excellent adhesion, consistent coverage, and high durability on brick or block surfaces.

Key Features

• Suitable for direct application onto masonry

• Easy to mix and apply manually

• Good surface adhesion and workability

• Sets quickly and provides a solid foundation for finishing layers

Method of Use
Ensure that the substrate is clean and free from dust, oil, and other contaminants. All surface cracks or breaks must be repaired prior to application.

Preparation Instructions

• For every 1 kg of plaster powder, add 500 grams of clean water.

• Mix thoroughly until a smooth, paste-like consistency is obtained.

• Apply the prepared mixture onto the surface using a trowel or spatula.

• Smooth the surface and adjust to the desired thickness.

• Allow the plaster to dry completely before applying any subsequent layers.

Technical Data

• Color: White

• Compressive Strength: Minimum 2.5 MPa

• Initial Setting Time: Approx. 45 minutes

• Final Setting Time: 1–2 hours

• Density: ~0.9 g/cm³

• Chemical Base: Hydrated gypsum with special additives

Fine-Grained Gypsum Plaster with Extended Workability for Final Finishing

Overview
PPG110 is a polymer-enhanced, fine-grained gypsum plaster designed specifically for final finishing over gypsum-based surfaces. Unlike standard gypsum plasters, it offers significantly extended workability time, allowing for a smoother and more controlled finish.

Key Features

• Extended workability (up to 60 minutes)

• Smooth and consistent finish

• Ideal for final coatings on gypsum-based substrates

• Easy to mix and apply

• Minimal shrinkage and good surface coverage

Surface Preparation
Ensure the substrate is gypsum-based, clean, and free of dust, oil, or any contaminants. Repair any cracks, holes, or surface damage before application.

Mixing Instructions

• Add 600 grams of clean water per 1 kilogram of PPG110 powder.

• Mix thoroughly using a mechanical mixer until a lump-free, paste-like consistency is achieved.

Application
Apply the prepared plaster with a trowel or spatula to the desired area. Smooth the surface evenly and build up to the required thickness. Let the surface dry completely before any further processing or painting.

Technical Data

• Color: White

• Compressive Strength: ≥ 3 MPa

• Initial Setting Time: ~60 minutes

• Final Setting Time: ~6 hours

• Density: ~0.9–1.0 g/cm³

• Chemical Base: Hydrated gypsum with specialized additives

Flexible, Polymer-Enhanced Gypsum for Cement-Based Surfaces

Overview
PPG313 Gypsum Gipton is a soft-grained, polymer-modified gypsum plaster designed specifically for application over cement-based substrates. Unlike traditional gypsum, it offers excellent adhesion to smooth surfaces and does not crack after drying. It is ideal for interior finishing layers where flexibility, smoothness, and crack resistance are essential.

Key Features

• Compatible with cement-based and smooth surfaces

• Crack-resistant after drying

• Easy to mix and apply

• Fast initial setting with a durable finish

• Lightweight formula with high coverage

Surface Preparation
Make sure the substrate is clean, dry, and free from dust, grease, oil, or loose particles. Confirm that the surface is cement-based. Repair any cracks or damage prior to application.

Mixing Instructions

• Add 600 grams of clean water per 1 kilogram of Gypsum Gipton powder.

• Mix thoroughly until a smooth, lump-free, paste-like consistency is achieved.

Application
Apply the prepared mixture evenly using a trowel or spatula. Smooth out the surface to the desired thickness. Allow to dry completely before further finishing.

Technical Data

• Color: White

• Compressive Strength: ≥ 5 MPa

• Initial Setting Time: ~10–15 minutes

• Final Setting Time: ~30 hours

• Density: ~0.9 g/cm³

• Chemical Base: Hydrated gypsum with specialized additives

The external final coating is applied by spraying with a pump or by hand (with a trowel) on the under-work surface that is clean and free of sticky, oily and scum materials. Excess mortar is removed from the surface and returned to the container. If needed, it is possible to apply an additional layer on top of the first layer by considering a drying period of one day.  If there are holes or a hairline crack on the surface, fill them with the external final coating and next day apply the external final coating. Moisturize the external final coated mortar with a little spray of water on the next day of applying.

Get ready to transform your construction projects with SIG’s new PRG-PRW Render Mortar, a high-performance base coat solution with upgraded adhesion, uniformity and durability. This multi-purpose base coat plaster, works perfectly for different projects from renovating rooftops and walls to completely DIYing façades and even lining a variety of surfaces. PRG-PRW is able to provide the perfect base coat plaster layer, ready for two or three subsequent lining applications. You can achieve a flawless skim coat finish at just 2–3 cm thickness using different forms of applications, helping you minimize waste and maximize quality.

Product Overview

PRG-PRW, is a plastering mortar formulated to prepare a smooth, crack-free and uniform surface with upgraded consistency. This base coat is designed to deliver an optimal substrate, ensuring that the skim coat is absolutely crack-resistant and blister-free. Compliant with EN 998-1 GP standards, our newest base coat mortar works perfectly for paints, tiles and decorative renders, making it the go-to choice for both new construction projects and renovation purposes.

Features & Technical Specifications

• High‑Performance Cement Blend: PRG-PRW is a mix of high‑grade gray or white cement, ensuring optimal strength and uniformity in every batch.
• Premium Formula: Our render mortar incorporates fine granulated lime particles for a smoother texture and a more enhanced workability.
• High-performance Additives: The upgraded formula helps PRG-PRW boost water retention and plasticity, giving the mortar a creamy consistency that’s easy to spread.
• Extended Workability Window: Despite instant adhesion on contact, the mortar remains workable for up to 30 minutes, giving you enough time for detailed finishing, even if it is your first time working with the material.
• Easy to Work With: This render mortar weighs around 1,800 g per liter when fresh, making it easy to handle and apply. This comes extra in handy for those who are trying to DIY a tiling or painting project, leaving a great first experience and neat, seamless results.
• Enhanced Strength: Our newest plastering mortar is able to achieve a comprehensive strength of over 10 N/mm² after 28 days, providing a durable and long‑lasting base coat.
• Efficient Coverage: A 30 kg bag of PRG-PRW, covers roughly around 0.6 m² at 2 cm thickness (≈50 kg/m²) of space, delivering consistent layers with virtually zero waste.
• Low Capillary Water Absorption: PRG-PRW keeps water absorption below 0.20 kg/(m²·h^0.5), protecting façades from moisture ingress even in exterior applications.
• Fire‑Reaction Rating: Our base coat contains under 1% organic content, meeting the highest non‑combustibility standards for complete safety.
• Standards Compliant: PRG-PRW fully conforms to EN 998‑1 Category GP and relevant BS EN test series for density, strength, and durability.

Benefits & Applications

1. Crack‑Resistant Base Coat: The 2–3 cm layer base coat of our product helps reduce shrinkage stresses compared to traditional 5–7 cm cement–sand screeds, resulting in a high-quality, seamless and crack-free finish.
2. Uniform Skim Coat: Even a complete beginner is able to create a smooth and blister‑free canvas for top‑coat renders or paints without any trouble.
3. Cost‑Effective & Eco‑Friendly: Our zero-waste bag design and precise mix formula helps cut down on material and disposal costs, leading to a more cost-effective and Eco-friendly outcome.
4. Versatile Usage: PRG-PRW is ideal for many different type of applications, from a plastering mortar on interior walls and exterior façades to concrete roofs and even beneath tile systems.
5. Rapid Application: The versatility in application and coverage, helps reduce labor time on large projects.

How to Use

• Surface Preparation:
  • First and foremost, make sure that the substrates (brick, block, concrete) are clean, sound, and free of dust, oils, or loose particles.
• Mixing Instructions:
  • Pour 5.5 L of clean water per 30 kg bag into a mixer.
  • Gradually add mortar while blending for 6–8 minutes until a homogenous, lump‑free consistency forms.
  • Adjust water ± 0.5 L to fine‑tune workability—less water for stronger, less shrink-prone layers.
• Application
  • Try to trowel a uniform 2–3 cm thick layer of the mortar; smooth out ridges before your initial set.
  • Cure for 24–48 hours at 20 °C / 50 % RH before proceeding with lining or skim coat.

Packaging & Storage

• Bag Sizes: PRG-PRW comes in 30 kg polypropylene bags. It is also available in 1–1.5 ton jumbo bags.
• Shelf Life: This product can maintain its performance for up to 18 months from production if kept unopened in a dry, ventilated area.
• Storage Tips: You can stack up to 8 bags high on a raised pallet. Don’t forget to protect the render mortar from ground moisture and direct sunlight.

FAQs

1. Can PRG‑PRW be applied over existing plaster?

Yes, simply ensure that the old layer is sound, cleaned, and primed before applying a new 2–3 cm base coat.

2. When can I paint or tile after the base coat?

Typically 48 hours of cure time at 20 °C and 50 % RH is enough. However, it’s a good idea to wait a little bit longer in cooler or more humid conditions.