Lay out all the materials you need for this job.
Tip: Ensure that the room, the staircase and the sealant are at room temperature.
Wipe the stairs clean.
Tip: Ensure that the surface is clean, free of dust and grease.
Apply plenty of sealant evenly along the joint.
Tip: Hold the Power Pistol at an angle of 45 degrees. Work from a corner, with the oblique side of the nozzle pointing downwards. Sometimes it is not possible to get into the sharpest corners with the sealant gun. Fill a section in front and then apply the sealant from the corner back out again.
Tip: If necessary, use a new nozzle for the correct diameter.
Finally, smooth the sealing joint gently by running a wet finger or putty knife over it.
Tip: Remove any residues immediately with a wet cloth.
After 30 minutes you can paint the joint.
Tip: For wide joints, preferably wait for 24 hours before painting. At lower temperatures, drying will be slower.
Admire the result!