CSLB C-33 Painting & DecoratingPlanning and EstimatingMedium
A painting contractor is reviewing a new set of specifications for a commercial repaint project. The specifications state, 'All surfaces to be painted shall be prepared to SSPC-SP 1 Hand Tool Cleaning prior to coating application.' What does this specification primarily indicate for the contractor's planning and estimating?
- AThe expected drying time for the specified topcoat.
- BThe need for specialized abrasive blasting equipment and associated safety measures.
- CThe type of primer to be used on all steel substrates.
- DThe requirement for a specific level of surface preparation using manual tools.
Show answer & explanationAnswer & explanation
Correct answer: D. The requirement for a specific level of surface preparation using manual tools.
SSPC-SP 1, Hand Tool Cleaning, is a standard for surface preparation that defines the removal of loose rust, mill scale, and old coatings by non-powered hand tools. This directly impacts labor hours and method of preparation.
Why the other options are wrong
- A. SSPC-SP standards do not dictate drying times; those are determined by the coating manufacturer's product data sheet.
- B. SSPC-SP 1 does not involve abrasive blasting; that would be standards like SSPC-SP 5, 6, 7, 10, etc.
- C. SSPC-SP standards primarily address surface preparation, not the type of primer, although preparation affects primer adhesion.
SSPC-SP 1 Hand Tool Cleaning
SSPC-SP 1 (Surface Preparation Specification No. 1) is a standard for Hand Tool Cleaning, which involves removing loose rust, loose mill scale, and loose paint by hand chipping, scraping, and wire brushing.
- Uses non-powered hand tools.
- Removes only 'loose' contaminants.
- A basic level of surface preparation.
Memory trick: SSPC standards are like a 'recipe' for surface readiness, specifying the 'tools' and 'cleanliness' needed.