Site Supervision, Field Operations, and Quality Control
Domain 5 tests field supervision and quality control: substrate inspection, surface preparation, environmental conditions, application, inspection, punch lists, and rework. The exam focuses on what a supervisor verifies before coating is applied.
Core rules
- Inspect and document substrate condition before prep: dryness, curing, dust, oil, rust, mildew, and defects. Use the specified surface preparation standard.
- Measure air and surface temperature, relative humidity, and dew point. Do not apply when the surface is below dew point or outside product limits.
- Control film thickness with wet-film gauges and verify dry-film thickness where specified. Check adhesion and coverage, including edges and back-rolled areas.
- Keep daily reports with area, product, batch, thinner, temperature, humidity, crew, and inspection results.
- Use mockups and first-room inspections as acceptance standards. Close punch items with photos and sign-off.
Worked example
Air is 75°F and relative humidity is 60%, giving a dew point near 60°F. A wall surface reads 58°F. Although the air temperature is acceptable, the surface is below dew point, so condensation can form and the coating may fail to adhere. The supervisor stops application, raises room temperature, and rechecks the surface before proceeding. The reasoning: product data usually limits both ambient and surface conditions; air temperature alone is not enough.
Traps
- Painting over damp or dusty substrate and expecting the finish to hide it.
- Checking only air temperature.
- Skipping wet-film or coverage checks on edges.
- Accepting a mockup without written criteria.
- Failing to document rework.