Nicotine stains can be stubborn but with the right approach you can successfully paint over them without the stain coming through.

Step 1 - Use a scraper to remove any loose, flaking paint if there is any. Rake out any cracks, and feather any paint edges with a fine grade sandpaper to make smooth.

Step 2 - Start by cleaning the ceiling with a strong cleaning solution such as sugar soap or a degreaser cleaner to remove as much nicotine residue as possible, allow to dry thoroughly.

Step 3 - Make any necessary repairs. Fill any cracks and small surface defects with a suitable plaster filler. If the old paint has been stripped back to bare plaster in patches, a fine surface filler can be used to even the surface before painting. Allow all fillers to dry fully, before sanding smooth and removing any surface dust with a damp cloth.

Step 4 - Once the surface has been fully prepared, apply a high quality stain-block primer such as Zinsser Cover Stain, this will prevent the stains from bleeding through to the topcoat and spoiling the finish. Once dry sand smooth.

Step 5 - Apply two full coats of a high quality ceiling paint of your choice, allowing adequate drying time between coats. Follow the paint manufacturers instructions for application.

Tip: Alternatively you could use an all-in-one stain block and finish paint such as Dulux Stain Block Matt to make the process a little easier.

Additional Tips:

Professional help - If you are unsure about the painting process, consider hiring a professional decorator. They have the experience and tools to handle the job effectively.

Important considerations:

Safety - Always wear protective gear like gloves, masks, and eye protection when working with cleaning solutions.

Ventilation - Ensure proper ventilation during the cleaning and painting process.