If it's a new car, you probably won't need to apply anything for several months. It should still be fairly waterproof for quite a while. If water beads up, you should not need to apply the Raggtopp right away. Now if the top gets dirty, clean it well with a soft brush and water and apply the RT when it's completely dry. There are a lot of good articles out there about convertable top care. One example: Convertible Top Care Detailing 101: clean and protect vinyl and fabric convertible tops.
They sell Ragg Topp products as well. Read up and have at it!!!
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