Module 2: Surface Preparation
This module is crucial for ensuring a flawless, long-lasting finish by teaching learners how to properly assess and prepare surfaces before painting or decorating.
1. Substrate Types
Plaster: Understanding porous surfaces, identifying fresh vs. old plaster, and the need for mist coats.
Wood: Recognizing bare timber, previously painted wood, and issues like knots or warping.
Metal: Differentiating between ferrous (prone to rust) and non-ferrous metals, and appropriate primers.
Masonry/Brickwork: Handling rough, absorbent surfaces and dealing with efflorescence (salt deposits).
2. Defect Identification
Damp & Mould: Spotting rising damp, condensation stains, and treating with anti-mould solutions.
Cracks & Gaps: Assessing structural vs. superficial cracks and selecting fillers (flexible vs. rigid).
Flaking Paint: Determining causes (moisture, poor adhesion) and methods for removal (scraping, heat guns).
3. Repair Techniques
Filling: Using interior/exterior fillers, smoothing techniques, and feathering edges.
Sanding: Selecting grits (coarse for shaping, fine for finishing) and avoiding over-sanding.
Priming: Applying sealers (e.g., stain blockers on water marks) and bonding primers for glossy surfaces.
4. Dust and Debris Management
Containment: Using dust sheets, masking tapes, and plastic barriers to protect adjacent areas.
Extraction: Employing vacuums with HEPA filters during sanding to reduce airborne particles.
Clean-Up: Safe disposal of lead-paint debris and chemical residues per environmental guidelines.
Practical Component
Scraping/Sanding: Hands-on practice removing old paint and smoothing surfaces.
Filling Holes/Cracks: Perfecting filler application with knives and sanding flush.
Priming: Demonstrating proper primer coverage and drying times.
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