What is crazing?

What Is Textile Crazing? 
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If your Sunbrella marine canvas or firmer outdoor fabrics create what looks like white cracked lines as you’re working on your upholstery, don’t stress. This is what is known as crazing and it’s totally typical and to be anticipated. Fortunately, this issue settle itself in time, and we’re here to clarify how this happens. 
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Crazing lines can show up on any solution-dyed, 100% acrylic textile that use products to create a level of resistance from the sun, mould and moisture. 
When your project is under construction it is folded, wrinkled and crease in this process as a natural result of sewing inside out and simply turning in the right way. no matter how carefully you may roll the fabric like a scroll while working to avoid it as much as possible. The impact is most recognisable on light-colored plain textiles. 
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This is how crazing may show up on a marine canvas.
Sunbrella marine grade canvas are treated with resistance products to not only help with mould, water and UV factors but also to create a firmer more solid fabric finish.The firm heavy quality of these fabrics is needed due to the popular marine applications such as awning shades, full sun and salt water exposure on boat seating as well as pool side daybeds. The firmness makes these fabrics stand up to the condition they are exposed too. 
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This effect is similar to crumpling paper where you will see shadowing and crease lines, the faint white marbling is effectively what is happening with the canvas.
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So this is what is happening to the fabric when applied, it is generally unavoidable, however do not worry this is not a permanent feature and does not affect the performance or quality of the fabric in anyway. This fabric will soften with age and line will become less noticeable. UV exposure and washing will also help reduce the effects of crazing.