Why are DFT readings used?

At VariBlast, we carry out detailed quality control checks throughout the preparation and coating process – including DFT (Dry Film Thickness) readings.

DFT readings are a key part of ensuring that coating systems are applied correctly and will perform as intended over the long term. Once a coating has dried, its thickness must fall within a specified range to provide the required level of protection. If the coating is too thin, it may not deliver adequate durability or corrosion resistance. If it is too thick, it can lead to issues such as cracking and premature failure.

Using DFT gauges, our team records readings across prepared and coated steelwork. This forms an essential part of our quality assurance process, providing both traceability and confidence that works are being carried out to the highest standard.

On projects such as Norwich Castle, where these images were taken and where elements of the steelwork will remain visible upon completion, achieving consistency is just as important as performance. Regular monitoring through DFT readings ensures a uniform finish while maintaining full compliance with the required coating system.

These checks are carried out as standard across all of our projects, reinforcing our commitment to quality, accuracy, and the long-term protection of structural steelwork.