Filled surfaces often require sanding with sandpaper. Adapt the grain size of the sandpaper to the substrate and the requirements for the finished surface. Use sandpaper with grain size 150–220 for painting walls and 180–220 for joinery.
If the surface is to be wallpapered, you can use a coarser sandpaper, but no coarser than 150, as there would then be a risk that scratches may be visible through the wallpaper. Grain that is too coarse when sanding plasterboard joints, for example, also roughens the surface of the plasterboards and can cause structural damage and increase absorption in the substrate, which often becomes visible through the layer of paint – especially on walls with raking light.
A sanding block on an extension pole makes it easier to work on ceilings and large wall surfaces. There is also special sanding machines (Giraffe) that make the job more efficient, less strenuous and more ergonomic. Make sure you use respiratory protection and protect your eyes.
Take care to remove all sanding dust from the surfaces. This is a must in order to achieve good adhesion between the substrate and the next treatment. Applying filler, painting or wallpapering on a dusty surface can cause delamination, i.e. the surface layer comes loose from the substrate. Use a vacuum cleaner and/or a soft brush to remove dust from the surfaces. If a high-pressure spray is to be used after sanding, also vacuum the floor in order to prevent dust from swirling around. Sanding machines such as those made by Giraffe are very practical, as they take care of the sanding dust ‘at source’. The machine can also be used as a vacuum cleaner.
Filled surfaces are absorbent and must therefore be primed before wallpapering. Use factory-made products that are recommended for this. Allow to dry well.
Remove any spillages and splashes using a sponge and water. Then wipe dry with a clean cloth. Also clean the tools in water. The best way to clean Airless machines is to pump water through them. Take care to keep the hopper clean. An Airless Machine can be stored with filler in it with no problem for one or two weeks. Cleaning is recommended if there is a longer break in operation.
Painting and wallpapering
Dalapro filler can be painted over using most regularly used paints. Silicate paint is fine. We do, however, advise against applying epoxy paints on decorating filler, as this can affect the binder in the filler, among other things. The general advice is: follow each manufacturer’s instructions regarding the choice of products and advice on how to perform the work. Most manufacturers have comprehensive product information that you can download from the Internet. You can also request product information from your supplier.