I have used both and, in my experience, I found the Aerospace 303 fabric treatment to last longer. I detail my Solstice every spring including cleaning and treating the top. While my car is generally in the garage unless it's on the road, and when it's on the road the top is usually down, I find that when I wash in the late autumn the water still beads up incredibly with the 303.Thanks. I did not know about a treatment! Did you have the best results with the Aerospace product? Wher do I look for these products? Aerospace item number?
Others swear by the Raggtop product. I will say that I wasn't disappointed with it by any means, and that my early experiences may have been off-set by "inexperience", I still think the 303 performed better.
Either way, pick a product and USE IT REGULARLY to keep things preserved!