Surface Preparation: The Key to a Long-Lasting Paint Finish

Every professional painter in Kampala will tell you the same thing: the quality of your paint job depends far more on what happens before the paint goes on than on the paint itself. In Uganda's climate, proper surface preparation can mean the difference between a finish that lasts 5 years and one that starts peeling within 6 months.

Step 1: Assess Your Wall Surface

Ugandan walls are typically made from cement blocks or burnt bricks, plastered with cement mortar and finished with a smooth or textured plaster. Before painting, inspect for:

• Cracks and holes — common due to building settlement in areas like Naalya, Bulindo, and other developing suburbs
• Damp patches — often from rising damp or leaking pipes, common in older Kampala buildings
• Efflorescence — white powdery salt deposits caused by moisture pushing through plaster
• Mold and mildew — prevalent in humid areas like kitchens, bathrooms, and lakeside properties
• Loose or flaking paint — existing paint that has failed and needs to be removed

Step 2: Clean the Surface

Wash walls with soapy water or a mild detergent to remove dust, grease, and dirt. In kitchens and commercial spaces, use a degreaser. Rinse thoroughly with clean water and allow to dry completely. In Uganda's humidity, this can take 24–48 hours depending on ventilation.

Step 3: Treat Problem Areas

For mold and mildew (common in Ugandan bathrooms and kitchens), wash with a bleach solution (1 part bleach to 3 parts water). For efflorescence, brush off the salts with a dry wire brush and address the source of moisture before painting. For cracks and holes, use a quality filler and sand smooth once dry.

Step 4: Sanding

Sanding smooths rough patches, removes imperfections, and creates a surface the paint can grip. Use medium-grit sandpaper (120–150 grit) for bare plaster and fine-grit (180–220 grit) for previously painted surfaces. Always wear a dust mask — even in Uganda's heat.

Step 5: Prime with NIM Undercoat

This is the most important step Ugandan painters often skip. NIM Undercoat:

• Seals porous plaster so the topcoat goes further (saving you money)
• Prevents alkali salts from bleeding through and causing discolouration
• Provides a uniform surface for better adhesion and a flawless finish
• Increases the durability of your paint job by up to 3 years

Apply one coat of NIM Undercoat and allow 4–6 hours drying time before applying your topcoat. For bare plaster or highly porous surfaces, a second coat is recommended.

Step 6: Apply Your NIM Paints Topcoat

Once your primer is fully dry, apply two coats of your chosen NIM Paints finish — whether it's NIM Emulsion Matt for a soft interior look, NIM Vinyl Silk for washable durability, or WEATHERGUARD by NIM Paints for exterior protection. Allow 4–6 hours between coats in dry weather, longer in humid conditions.