Bye-bye, Stiffness!
Pre-washing helps dodge the old shrinking canvas surprise. This is particularly relevant if you plan to use the canvas for a project where size stability is crucial. Factors contributing to shrinkage include the type of fabric used, the weave of the canvas, and the temperature and method of washing. By pre-washing the canvas, you can minimize the risk of unexpected shrinkage, ensuring that your project turns out exactly as planned. Additionally, pre-washing can also help remove any sizing or chemicals from the fabric, making it easier to work with and ensuring a better end result.
Removal of Chemical Residue
Canvas often comes with a bit of a “fresh from the factory” cocktail of chemicals. Pre-washing helps to bid adieu to any residue that may interfere with your paints or cause unexpected reactions. Pre-washing also helps to soften the canvas and remove any sizing or starches that were used in the manufacturing process. It can also help to shrink the fabric to prevent any future warping of the canvas during the painting process. Many artists consider pre-washing to be an essential step in preparing their canvas for painting, much like bricks and mortar construction techniques are essential for building a solid foundation for a house.
Temperature’s Tightening Effect
When this fabric meets water, it’s not just a wash—it’s a full-on dance of the fibers. As mentioned, cotton fibers absorb water, expand, and then shrink, but it’s not a one-time show. Repeated exposure to water can cause ongoing shrinkage, reshaping your canvas over time.
This is why prewashing or water-treating your canvas fabric is a smart move, especially if you’re using it for items that will face the elements or frequent laundering.