Knauf Fill & Finish Jointing Compound (5kg)

By Knauf · Model: Fill & Finish · Building Materials

Lightweight ready-mixed jointing compound for plasterboard joints, achieving a seamless finish in two coats without the need for separate filler and finisher.

2-in-1 compound — fills and finishes plasterboard joints in one product
Ready-mixed for immediate use — no powder mixing required
Lightweight formula is easy to sand for a smooth finish
Low shrinkage reduces the need for additional coats
Compatible with Knauf jointing tapes and all standard plasterboard
5kg tub covers approximately 40 linear metres of joints

Overview

Knauf Fill & Finish has simplified plasterboard jointing by combining the fill coat and finish coat into a single product. Traditional jointing required a separate filler compound and a finishing compound, but Fill & Finish handles both stages, reducing the number of products on site and speeding up the dry-lining process.

In-Depth Look

Knauf Fill & Finish is the jointing compound that has made plasterboard finishing accessible to a wider range of trades. Where traditional jointing systems required experience to mix powder compounds to the correct consistency and skill to apply a separate fill coat and finish coat, Fill & Finish comes ready-mixed at the correct consistency for immediate use.

Two Coats, One Product

The first coat is applied over the jointing tape, embedding it and filling the joint recess flush with the board face. A wide jointing knife — typically 150-200mm — is used to feather the compound 100-150mm either side of the joint on this coat. Once fully dry (approximately 24 hours in normal conditions), the second coat is applied over a wider area, feathering out 250-300mm either side to create a seamless transition between boards. With traditional two-product systems, the fill coat used a heavier compound and the finish coat a lighter one; Fill & Finish handles both stages with the same product, reducing confusion and waste.

Jointing Tape

Fill & Finish is used with paper jointing tape embedded in the first coat. The tape bridges the joint and prevents cracking from board movement. Paper tape requires the base coat to be applied first, the tape pressed into it, and then a further thin layer worked over the tape to lock it. Mesh tape can also be used but is more prone to cracking with lightweight compounds.

Sandability

The lightweight formula sands easily with 120-grit paper, which is critical for achieving a paint-ready surface. Heavier compounds can be difficult to sand without creating gouges or burnishing the surface, but Fill & Finish feathers out cleanly with a sanding block. The compound should be fully dry before sanding — any residual moisture causes the paper to clog and the surface to roll rather than sand.

Verdict

Knauf Fill & Finish is the jointing compound that makes plasterboard finishing straightforward. The 2-in-1 formula, ready-mixed convenience, and easy sandability make it the practical choice for both professional dry-liners and builders taping joints as part of a wider project.

Specifications
Weight	5kg
Type	Ready-mixed, lightweight
Coverage	~40 linear metres per 5kg
Coats Required	2 (fill coat + finish coat)
Drying Time	Approximately 24 hours per coat
Shelf Life	12 months unopened

Who It's For

Dry-liners and plasterers finishing plasterboard installations
Carpenters and general builders taping plasterboard joints
DIY renovators fitting plasterboard in home improvement projects

Pros & Cons

Pros

One product replaces separate filler and finisher compounds
Ready-mixed — no measuring or mixing powder on site
Lightweight formula sands easily for a smooth finish
Low shrinkage minimises rework between coats

Cons

24-hour drying time between coats slows progress
5kg tub is relatively small for large dry-lining projects
Must be stored frost-free — freezing ruins the compound

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