This chemical treatment coats yarns with a hydrophobic layer, causing moisture to bead up and roll off the surface rather than soaking in. Unlike full waterproofing, these finishes allow air and water vapor to pass through, maintaining the fabric's breathability. They are typically applied during the final finishing stages of textile production and may require heat activation or reapplication after heavy washing.
Heard on the job
We need to reapply the water repellent on this batch of canvas because the sample failed the spray test.
Insider tip
Durable water repellent (DWR) coatings eventually wear off; if water stops beading on the surface, the garment needs to be retreated.