CDPH Lead Inspector/Assessor California State Practice Exam

How should the WFT Gauge be used to obtain an accurate reading?

1. By pressing it into dry paint

2. By withdrawing it immediately from wet paint

3. By leaving it in the paint for 1 minute

4. By shaking it before use

The correct answer is: By withdrawing it immediately from wet paint

Using the WFT (Wet Film Thickness) Gauge correctly is crucial for obtaining accurate readings of the wet film thickness of paint. The WFT Gauge is designed to measure the thickness of wet paint immediately after application. When a reading is taken, it should be withdrawn from the wet paint immediately to ensure that the measurement reflects the actual thickness at that specific moment. If the gauge is left in the paint for an extended period, it may lead to inaccurate measurements due to the settling of paint or changes in wet film properties. This immediate withdrawal captures the thickness effectively, allowing for proper assessment of the applied material and ensuring compliance with specified standards. In this context, the correct approach ensures that users can accurately determine whether they have applied the paint to manufacturer's recommendations.