Knauf Fill & Finish Jointing Compound (5kg)

In-Depth Look

Knauf Fill & Finish is a ready-mixed jointing compound for plasterboard. Where traditional jointing used powder compounds mixed on site, with a separate fill coat and finish coat, Fill & Finish comes ready to use for both stages.

Two Coats, One Product

The first coat is applied over the joint and tape, filling the joint recess flush with the board face. Once dry (retailers give 12 to 24 hours depending on conditions), a further coat is applied over a wider area and feathered out to blend the joint into the board. Follow Knauf’s instructions for knife widths and the number of coats.

Jointing Tape and Beads

Knauf recommends paper jointing tapes, paper-faced beads and metal corner beads with this compound. Follow the instructions on the tub for how to bed the tape.

Sanding

The lightweight formula is designed for sanding to a smooth, paint-ready surface. The compound should be fully dry before sanding, because residual moisture clogs the abrasive. Follow the tub instructions for the grade of abrasive to use.

Summary

Knauf Fill & Finish does both the filling and finishing coats of plasterboard jointing from one ready-mixed tub. Retailer data gives about 11.25m² per 5kg tub and 12 to 24 hours drying per coat, so check the tub and plan drying time into the job.

How It Compares

The 5kg tub of Knauf jointing compound is the lightweight ready-mixed product that retailers list as Fill & Finish Light. It is used for bedding tapes and finishing joints on drywall partitions and ceilings. Knauf lists it as low shrinkage and suggests two coats. Drying takes 12 to 24 hours depending on conditions. Retailer data estimates coverage at 11.25m2 per 5kg tub. It is recommended with paper tapes, paper-faced beads and metal corner beads, and Knauf lists it as EN 13963 type 3A.

The table compares it with other finishes for plasterboard joints.

Taping and jointing finishes the joints only, while skimming covers the whole wall. Which one you choose depends on the finish you want and the level of skill you have. For a tool used on skimmed finishes, see the OX Speedskim plastering rule.

Always check the data sheet for the exact product you have bought, and follow the manufacturer’s instructions.

Handling and storage are worth planning before you open the tub. Keep the lid on between sessions and reuse any leftovers rather than letting them dry out in the open. Store the tub in a cool, dry place away from frost and sunlight. Knauf gives a shelf life of 12 months from the production date, so check the date on the tub if it has been stored for a while.

The name on the tub may differ from the product page, because retailers list the lightweight 5kg tub as Fill & Finish Light. Check the name and the data sheet to be sure you have the product described here. Wear dust protection when you sand, and follow the manufacturer’s instructions throughout.

Common Questions

How many coats of jointing compound do I need? Knauf suggests two coats. Drying takes 12 to 24 hours depending on conditions, so let each coat dry before applying the next. Temperature and ventilation both affect drying.

Which tape works with it? Knauf recommends it with paper tapes, paper-faced beads and metal corner beads. Check the data sheet for the exact tape you plan to use.

How long before I can sand and paint? Wait until the compound is fully dry. Sand with fine sandpaper, wear dust protection and avoid breathing the dust. Then prepare the surface for decorating following the paint maker’s instructions.

How do I store leftover compound? Keep the lid on and reuse leftovers. Store the tub in a cool, dry place away from frost and sunlight. Shelf life is 12 months from the production date.

How much do I need? Retailer data estimates 11.25m2 of coverage per 5kg tub. Treat it as a guide, as real coverage depends on how it is applied.