The Festool Planex LHS 2 225 long-reach sander

Filling and sanding drywall

The perfect surface thanks to the right filler

If you ask a painter how to achieve clean drywall and what materials and tools to use for the best result, there’s really only one serious answer: it depends! We have tried to shed a little light on this topic.
In drywall construction, filling and sanding are standard procedures. That said, when you look at everything involved in achieving a clean and perfect surface, these tasks are anything but ordinary. It comes down to the details, bringing them together into a coordinated overall package. After all, fillers from different manufacturers have different properties and should be worked on and sanded with the right tools.

Filling

Drywall construction involves gypsum boards with different types of edges. The most common are boards with half-rounded tapered longitudinal edges and bevelled cut edges. With supporting materials such as timber posts or derived timber boards, hygrothermal tension occurs in the substrate which can lead to the formation of cracks in the filling. To achieve a stable, long-lasting result in both cases, it is a good idea to use filler materials with especially high joint stability and to use reinforcing or joint tape strips.
The right application for drywall with Festool tools

Filler compounds

  • Filler putty is specially designed for filling joints with joint tape.
  • With joint filler, plasterboard joints are filled without joint tape.
  • Fine filler is used to ‘finish’ filler putty or joint filler; it forms the finished surface of the joint.
  • The right application for drywall with Festool tools

    Types of filler

  • Gypsum-bonded fillers are available as bagged goods in powder form. A compact crystal structure forms as it sets, and the filler achieves very high joint stability.
  • Application: joint filling for plasterboard (Q1 and Q2) and full-surface filling with higher layer thicknesses.

  • Plastic-based fillers are available ready-mixed in buckets. They air dry. Depending on the product and application, the filler needs to be stirred before use.
  • Application: full-surface filling of plasterboard (Q3 and Q4), thin reworking of old plaster or concrete surfaces.

    sand

    If you know the material and have mastered the technique, you can achieve any surface quality. It takes time, attention to detail and the perfect tool. Including, and especially, with drywall. After the filler has hardened and dried, unevenness and grooves at the joints and edges are sanded out – on Q4 surfaces, even the full-surface filler. The new PLANEX 2 225 long-reach sander is perfect for full-surface and flat sanding. The LED grazing light on the sanding pad achieves surfaces of the highest quality. The Granat and Granat Net abrasives are ideal for perfect sanding results.
    The right application for drywall with Festool tools

    Abrasives recommendation

    Even when choosing your abrasive and grit, the same rule applies: it depends! – on the material, the tool and what surface quality you want to achieve. We have compiled several recommendations in connection with the new PLANEX LHS 2 225 here, and you can find more information on our website.
    Festool abrasives overview