Wet Film Thickness Calculator
The target thickness of the cured paint layer.
Percentage of non-volatile material in the coating. (This tool computes unthinned WFT = DFT / (Solids / 100).)
Understanding Wet Film Thickness for Industrial Coatings
Industrial painters on active jobsites need to translate coating specifications into practical application targets so they know exactly how thick to spray the wet material before it cures. This calculator eliminates guesswork by deriving the necessary wet film thickness directly from the dry film requirement and the coating's volume solids, ensuring compliance with project specifications.
Every coating contains solvents that evaporate during the drying process, leaving behind the solid film. Knowing the volume solids percentage is crucial for applying the correct amount of wet material to achieve the desired dry film thickness, preventing costly rework or premature coating failure.
How to Use This Calculator
- Enter your desired Dry Film Thickness from the project specification sheet into the first field.
- Input the Volume Solids percentage found on the Safety Data Sheet or Product Technical Data Sheet.
- Switch the Mode toggle to "Calculate WFT" to find your application target, or to "Verify DFT" if you have already measured the wet coat and want to see the resulting dry film.
- Read the large result display to see the required thickness in mils.
- Adjust any value instantly to run what-if scenarios or test different coating brands and their specifications.
FAQ
Q: How do I calculate wet film thickness from dry film thickness?
A: Divide your dry film thickness by the volume solids percentage divided by 100: WFT = DFT / (Solids / 100).
Q: What happens if the coating has less than 100% volume solids?
A: The wet film must be thicker than the dry film to compensate for solvent evaporation; for instance, a 50% solids coating requires twice the wet thickness to achieve a given dry thickness.
Q: Can I calculate WFT for thinners or reducers?
A: This tool calculates for unthinned coatings; adding thinner reduces the effective solids content, which increases the required WFT beyond this calculation, so always adjust for thinner ratios in your mixing procedure.
Q: What is the difference between WFT and DFT gauges?
A: A WFT gauge is a stepped comb used to measure liquid film thickness during application, while a DFT gauge measures the cured solid layer; this calculator mathematically links the two readings using the volume solids ratio.