Name: Tony
Message: Hi, I would like to change the color of my car's canvas top from light grey to a darker navy blue. Of course the top was probably treated at the factory with some type of water repellant. Is there a dye that will work for this in spite of the water repellant treatment?  If so, where can I get it - cost, email and phone #? Thanks very much, 

No, I'm afraid that anything that repels water will repel dye, as well.

Another problem is that you do not know what fiber the canvas is woven from. You must know the fiber content in order to match the dye to the fiber content. Without knowing the fiber content, it is impossible to select the correct dye.

However, I suspect that it is made from polyester or acrylic, neither of which is practical for the novice to dye at home. Few custom dyers will dye a polyester garment, but they will not dye anything which cannot be put into a dyeing machine or dyepot; most custom dyers refuse to dye anything that is not constructed of natural fibers such as cotton, silk, linen, or wool.

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[link updated November 29, 2007]