Recasens acrylic canvas fabric is water and mould repellent and will last a very long time if maintained well. However, over time, the accumulation of dust, pollution particles, organic plant matter, pollen and general dirt can embed itself into the fabric and shorten the life of it.
It is a good idea to periodically give your umbrella fabric a light brush down with a soft bristled brush/broom and water from a garden hose. This will help to dislodge and remove loose dust and dirt that has settled on the fabric before it can embed itself more deeply. Although mould will not grow directly on clean acrylic canvas, as dirt and organic matter embeds itself into the fabric the mould will be able to grow on the embeded dirt and organic matter, so it is best to remove dirt earlier.