An AI-powered platform for Students and teachers, designed to help you learn faster.

How do you convert WFT to DFT?

DFT = WFT × % Volume Solids / 100. For example, if WFT is 200 µm and volume solids is 65%, DFT = 200 × 65 / 100 = 130 µm.

What is the theoretical coverage formula for paint?

Theoretical Coverage (m²/L) = (10 × % Volume Solids) / DFT (µm). This gives the maximum area one liter of paint can cover at the specified dry film thickness, assuming no losses.

What is a typical volume solids percentage for industrial coatings?

Epoxy primers typically have 50-65% volume solids, while zinc-rich primers range from 40-55%. Polyurethane topcoats are often 50-60%. Always check the Product Data Sheet (PDS) for the exact value.

WFT DFT Paint Coverage Calculator (NACE/AMPP)

Volume Solids (%)

Wet Film Thickness, WFT (µm)

Dry Film Thickness, DFT (µm) — optional

Surface Area (m²) — optional

Practical Application

Coating inspectors use this math on site daily to verify painters are applying adequate wet film thickness. Use a wet film gauge (comb-type) immediately after application, then compare with the calculated DFT to ensure compliance with the specified NACE/AMPP coating system.

Loss Factors

Theoretical coverage assumes zero loss. In practice, apply a loss factor of 20-40% depending on application method (airless spray, brush, roller), surface profile, and environmental conditions. Consult SSPC-PA 2 for measurement procedures.