PCS PCS Coating Systems and Specifications 1 — Questions and Answers
Question 1: What document defines the coating system requirements, surface preparation standards, and acceptance criteria for a project?
- Purchase order
- Coating specification (Correct answer)
- Safety data sheet
- Material certificate
Correct answer: Coating specification
A coating specification is the binding document that defines all technical requirements for a coating project, including prep standards, products, and acceptance criteria.
Question 2: Which coating system type is most commonly specified for structural steel exposed to industrial atmospheric conditions?
- Single-coat alkyd
- Three-coat zinc/epoxy/polyurethane system (Correct answer)
- Latex house paint
- Bituminous coating
Correct answer: Three-coat zinc/epoxy/polyurethane system
A three-coat zinc primer, epoxy intermediate, and polyurethane topcoat system provides optimal corrosion protection and durability for industrial atmospheric steel.
Question 3: When a coating specification calls for a 'DFT' of 3–5 mils, what does DFT stand for?
- Dry Film Thickness (Correct answer)
- Dense Film Testing
- Dual Film Treatment
- Direct Finish Texture
Correct answer: Dry Film Thickness
DFT stands for Dry Film Thickness, the measured thickness of a cured coating layer expressed in mils (thousandths of an inch) or microns.
Question 4: A generic coating specification references 'SSPC-PS Guide 20.00.' What type of information does this guide provide?
- Approved contractor lists
- Coating system selection guidance by environment (Correct answer)
- Blast media specifications
- Holiday testing procedures
Correct answer: Coating system selection guidance by environment
SSPC-PS Guide 20.00 provides guidance for selecting appropriate coating systems based on the service environment and substrate type.
Question 5: Which factor is MOST critical when selecting a topcoat resin type for a coating system exposed to UV radiation outdoors?
- Chemical resistance
- UV stability and chalk resistance (Correct answer)
- Film build per coat
- Pot life at 70°F
Correct answer: UV stability and chalk resistance
UV stability and chalk resistance are the primary topcoat selection criteria for outdoor exposure to prevent color fading and film degradation.
Question 6: What is the purpose of a 'tie coat' (also called an intermediate coat) in a multi-coat coating system?
- To provide color
- To promote adhesion between incompatible coating layers (Correct answer)
- To seal pinholes in the substrate
- To increase surface roughness
Correct answer: To promote adhesion between incompatible coating layers
A tie coat promotes adhesion between two coating layers that would otherwise be incompatible, ensuring intercoat bond integrity throughout the system.
PCS PCS Coating Systems and Specifications 1
What document defines the coating system requirements, surface preparation standards, and acceptance criteria for a project?