What is Crazing? (also known as Veining or Marbling)

Crazing refers to the appearance of thin, white or dark lines or marks that can sometimes be seen on marine-grade, solution-dyed acrylic canvas fabrics. These marks occur when the fabric’s protective surface finish fractures — typically from folding or creasing during sewing, handling, or installation.

This is called “crazing”, and it’s completely normal to see in brand new, “stiff” acrylic canvas, especially with lighter colours. As the fabric softens and wears in over time, these marks will gradually fade and become much less noticeable.

Why Does Crazing Occur?

Marine-grade acrylic canvas is finished with a special coating designed to:

1. Enhance water repellency
2. Improve UV resistance
3. Provide structure and stiffness for easier sewing and fabrication

When this protective finish is disturbed — usually by folding, compressing, or creasing the material — it can develop fine surface fractures. These tiny fractures reflect light differently, appearing as pale lines or veins on the fabric surface.

What Does Crazing Look Like?

Crazing typically shows as faint, white, vein-like lines or marbled patterns, most visible where the fabric has been folded or tightly creased. These lines are purely cosmetic and will soften and disappear as the fabric relaxes and is exposed to normal outdoor conditions.

Does It Affect the Fabric’s Performance?

No — crazing is a surface appearance only and does not affect the fabric’s strength, durability, or performance. The material remains fully water-repellent, UV-stable, and weather-resistant.

Over time, as the canvas softens through use and exposure, these marks will naturally blend in with the rest of the fabric.

Conclusion

At Instant Shade, we take great care in the production of our umbrella canopies and protective covers. Every product is crafted using high-quality marine-grade acrylic to ensure longevity and performance.

While crazing can sometimes appear in new canvas, please rest assured that it’s a normal and temporary characteristic of premium outdoor fabric — one that will soften and disappear as the material settles and wears in.