Prepare surfaces for commercial painting: top London painter’s insights

1 Initial Inspection and Assessment

Begin with a detailed inspection of the surfaces to be painted. Look for signs of wear and damage, such as peeling paint, cracks, mould, or water stains. This inspection helps identify areas that need repair and tailors the preparation process to the specific needs of the surfaces.

• Identify Surface Types: Different materials (e.g., wood, metal, concrete) have unique preparation requirements. Understanding the surface type helps in selecting the right tools and materials.
• Evaluate Existing Conditions: Note areas with significant damage or previous poor-quality paint jobs that may require more intensive preparation.

2 Cleaning the Surfaces

Cleaning is crucial for removing dirt, grease, and other contaminants that prevent paint from adhering correctly. Over time, surfaces, especially in high-traffic commercial environments, accumulate layers of grime that must be thoroughly cleaned.

• Pressure Washing: For large exterior surfaces, pressure washing removes loose paint, dirt, and grime. This is particularly useful for buildings in London’s busy areas where pollution and traffic contribute to surface buildup.
• Degreasing: Use degreasers to tackle oily or greasy stains, common in commercial kitchens or industrial areas.
• Mildew Treatment: Apply a mildew remover to areas affected by mould or mildew, often seen in damp London basements or shaded exterior walls.

3 Surface Repairs and Patchwork

Once the surface is clean, address any damage that could affect the paint’s finish and durability. This step is critical for ensuring a smooth and even painting surface.

• Filling Cracks and Holes: Use appropriate fillers for the surface material to fill any cracks or holes. Allow the filler to dry, and then sand it smooth.
• Replacing Damaged Sections: In cases of severe damage, it may be necessary to replace sections of the surface entirely.
• Smoothing and Levelling: Sand down any rough or uneven areas to ensure a consistent surface for painting.

4 Surface Sanding

Sanding is essential for creating a texture that helps paint adhere better. It also smooths out any rough patches or previously filled areas.

• Mechanical Sanding: Mechanical sanders expedite the sanding process and ensure uniformity for large surfaces.
• Hand Sanding: Use hand sanding for smaller areas, edges, or intricate details that mechanical sanders can’t reach.

5 Masking and Protecting Areas

Protecting non-paintable areas is vital to avoid accidental spills or overspray. This includes windows, doors, fixtures, and any other elements that should remain paint-free.

• Drop Cloths: Cover floors, furniture, and other items with drop cloths to prevent paint splatters.
• Masking Tape and Plastic Sheeting: Use masking tape and plastic sheeting to cover edges, trim, and any areas adjacent to the painted surfaces.

6 Priming the Surfaces

Priming is critical in distinguishing a professional paint job from an amateur one. Primer creates a base coat that enhances paint adhesion and provides a uniform surface for the final colour.

• Select the Right Primer: Choose a primer compatible with the surface type and the chosen paint. For example, metal surfaces might require a rust-inhibiting primer, while wood may need a stain-blocking primer.
• Apply Evenly: Ensure an even application of primer to avoid blotches or uneven absorption of the topcoat.