At PZSSS, one of the most frequently asked questions from customers is: "Exactly how many buckets of paint do I need to buy?" Buying too much wastes cost, while buying too little leads to work stoppages waiting for materials. Mastering the calculation method for paint coverage rate is the key to controlling budget and improving project efficiency.
1. Theoretical Spreading Rate (TSR) The theoretical spreading rate refers to the area that one liter of paint can cover under ideal conditions when achieving a specified thickness.
The calculation formula is as follows: Theoretical spreading rate (m²/L) = (volume solids % × 10) / dry film thickness (μm)
For example: For instance, a PZSSS product with a volume solids content of 60% and a required dry film thickness of 100μm would be calculated as: (60 × 10) / 100 = 6 m²/L
2. Consider the "loss coefficient"
The actual construction environment is not a laboratory. You must account for losses caused by the following factors:
- Surface roughness: Steel surfaces after sandblasting are more "thirsty" for paint.
- Construction method: The loss rate of spray application (usually 30%-50%) is much higher than that of rolling or brushing.
- Weather factors: During outdoor operations, strong wind will blow away part of the paint mist.
3. Practical Spread Rate (PSR)
To obtain the actual purchase quantity, you need to multiply the theoretical spreading rate by the estimated efficiency (e.g., 30% loss corresponds to an efficiency of 0.7).
- PZSSS Advantages: Our product technical data sheet (TDS) provides accurate volume solids data to help you reduce blind estimation and maximize the value of every drop of coating.
