Grinding corners - these tools are suitable for this

Numerous tools with different handling and different performance are available for sanding large surfaces. However, problems often arise when sanding corners and hard-to-reach areas. Here you can find out how best to grind there.


  • Grinders
  • Multitools
  • Sanding fingers and sanding finger attachments
  • Pot wire brushes
  • Alternatives
  • Also read - Grinding Forstner bits - this is how it works
  • Also read - Sharpening Diagonal Cutters - How To Proceed
  • Also read - painting and varnishing - which tools are suitable for what?


Grinders can either have a straight leading edge or be triangular in shape. The triangular tapered devices can be used with appropriate sandpaper for different materials and abrasion thicknesses.

The point takes you very far into most of the inside corners. However, the so-called delta sander does not always reach the very last corner. Tasks such as sanding the window require greater precision if the paint is to be removed everywhere.


Multitools such as the Dremel (€ 159.99 at Amazon *) Multi or similar devices usually have different sanding attachments that can get into the tightest corners. When using on wood, for example when stripping old wooden windows, you have to be careful not to damage the right-angled edge with some attachments.

Sanding fingers and sanding finger attachments

Sliding finger devices are rather rare, but sling finger attachments are available for most commercially available multitools. They have a round end and taper to a very fine point. This also brings you into very narrow areas.

As with a normal sander, any type of sandpaper can be attached to the sanding finger attachment. Rough cuts can also be made in this way.

Pot wire brushes

Pot wire brushes - also as an attachment for the drill (€ 48.00 at Amazon *) - can in some cases be a suitable means of removing coarse layers from the corner (e.g. sticky layers of synthetic resin paint). The bristles of the pot wire brush can be easily pressed into the corner when sanding.

If necessary, protect sensitive areas that should not be damaged (window glass) beforehand.


Paint remover

Paint strippers are certainly an alternative. They remove surface layers chemically and automatically get into the corners. The squareness of the corners is also retained during stripping, unlike it is often the case with sanding.

Sandblasting or dry ice blasting

In some cases - for example when sanding down wooden stairs, sandblasting or dry ice blasting could also be used as an alternative. Mobile laser technologies are the modern version of sandblasting, but they are not yet very widespread.

Tips & Tricks When it comes to breaking edges (i.e. sanding the edge), you have less to worry about: simply use an ordinary (straight) sanding device at a 45 ° angle and guide it slowly and evenly over the edge.