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Gyprock Jointmaster is a pre-mixed heavyweight topping compound developed to provide the perfect finish coat in a three coat plasterboard jointing system.

Product Overview

Jointmaster is a heavyweight topping compound used as the final coat in a three coat jointing system. It is formulated to provide a smooth even finish with machine sanding, and excellent paintability. This low-VOC compound is available in a convenient premixed form for easy application and is ready for sanding and painting approximately 24 hours later.

Typical Applications

Gyprock Jointmaster is typically used as a top coat in a three coat jointing system in residential and commercial walls and ceilings. While it can be hand applied, it flows smoothly through a finishing box.
Gyprock® Jointmaster Topping Compound in 20kg bucket.
Australian Made logo in black and white

Australian Made

Licensed by Australian Made Campaign Ltd
pre mixed icon with compound and tool


Quick to prepare, easy to apply

hand mechanical tool icon with tools

Hand and Machine Tool Applied

Easy application with a range of tools

grit free icon

Smooth Finish

Ideal for machine sanding

Technical Specifications

Product Options

Gyprock Jointmaster is available in the following pack size: 

Pack 20kg Pail (12L approx.)
Coverage 10kg/100m2

Shelf life is 1 year from manufacture

For product availability and to place an order, contact your nearest supplier.

Physical & Chemical Properties

Specific gravity (H20=1) 1.6 - 2.0
VOC content (as specified by GBCA)

1g/L as VOC content per material 

Product Manufacture

Gyprock Jointmaster is manufactured by CSR Gyprock in Australia to stringent product specifications.

Product Handling

Transportation and manual handling: Refer to the Gypsum Board Manufacturers of Australia (GBMA) website for recommended OH&S practices.

Storage: Store buckets of compound in a dry environment out of direct sunlight. Remove lid and stir prior to use. Unused product should be stored by resealing the original bucket. Remix prior to use. Discard if drying has commenced.

Health and Safety

Safety Data Sheets are important documents in the construction industry and assist in the continuing focus on occupational health and safety on and off sites.



Installation Instructions

Installing to Standards

AS/NZS2589: Gypsum linings – Application and Finishing outlines the procedures for jointing and finishing of Gyprock plasterboard in conjunction with additional details contained in Gyprock Technical Literature. 


Gyprock makes available resources that provide comprehensive selection, design, installation and maintenance guidance. 

Installation Resources

Residential and commercial installation instructions.

View Resources
Australian Made

Australian Made

Licensed by Australian Made Campaign Limited to use the Australian Made Logo.
Manufactured For Life red logo with the shape of Australia in the centre.

Manufactured for Life

Gyprock plasterboard products are manufactured for life with all CSR products designed to achieve optimal performance when part of a CSR integrated system.

GECA Accredited

Verified by an independent conformity assessment body to meet the environmental, health and social/ethical criteria of the GECA Adhesives, Fillers & Sealants standard.