Paint, primer & coatings
Paint quantity is driven by surface area, actual product coverage, number of coats, surface texture, color change, and the condition of the substrate.
Quick reference
| Item | Planning data |
|---|---|
| Coverage | Use the coverage range on the exact product label. Rough, porous, or previously unpainted surfaces may use more. |
| Coats | Estimate each coat separately; primer is a separate material when required and should not be counted as finish paint. |
| Sheen | Flat, eggshell, satin, semi-gloss, and gloss differ in appearance, cleanability, and how strongly they show surface defects. |
| Primer | Choose primer for the substrate and problem: new drywall, stains, bare wood, masonry, or adhesion issues may require different products. |
Values marked common or typical are starting points, not a specification. Confirm the actual product data sheet, label, and project documents.
Preparation first
Repair defects, clean the surface, remove loose paint, and allow surfaces to dry. Painting over chalk, grease, moisture, or failing coatings often leads to poor adhesion.
Estimate gallons
Calculate the actual area, multiply by the number of coats, and divide by the product's stated coverage. Add allowance for surface conditions and touch-ups; round up to package sizes.
Match product to location
Interior/exterior use, moisture exposure, substrate, temperature, and cleanup requirements matter. Follow label limits for temperature, humidity, ventilation, and recoat time.
Common mistakes
Using one coverage rate for every surface; skipping primer when the system requires it; failing to test colors; and recoating before the label's minimum time.
Continue planning
Further reading: Manufacturer or industry reference ↗. External guidance may not replace local requirements or product-specific instructions.