Coating inspection reference
The tables an inspector reaches for between measurements. The arithmetic tables are exact; the summaries and ranges are cautious orientation - the standards, product data sheets, and your project specification govern.
One-paragraph working summaries of SSPC-SP 1, SP 2, SP 3, SP 5, SP 6, SP 7, SP 10, and SP 11 surface preparation standards for coating inspectors.
CoverageCoating coverage tableTheoretical spreading rate table: square feet per gallon by volume solids and dry film thickness, from the 1604 mil sq ft per gallon constant.
Ambient conditionsDew point and spread tableDew point temperatures by air temperature and relative humidity from the Magnus formula, with the common 3 degree Celsius surface spread rule.
Film thicknessCommon DFT ranges by systemTypical per-coat dry film thickness territory for common generic coating system types, in mils and microns, with the caveats that matter.
Frequently asked questions
Where do the reference numbers come from?
The coverage and dew point tables are pure arithmetic - the 1604 mil sq ft per gallon identity and the Magnus formula - so they are exact. The surface prep summaries and DFT ranges are careful descriptions of common territory, with the standards and product data sheets governing.
Can I rely on these tables for acceptance decisions?
Use them for orientation and sanity checks. Acceptance belongs to the project specification, the product data sheet, and calibrated instruments in the field.