As I have posted in another thread, you cannot re-waterproof a Vango Aspen.
Synthetic tents, such as the Aspen, are waterproofed by means of a coating (usually polyurethane or PU) being bonded to the inside of the flysheet during manufacture. Eventually, this coating will deteriorate. You can help with water run-off by applying Fabsil (or something similar) to the outside of the fly, but I'm afraid once the PU (or other) coating is goosed, then the tent is goosed.
Having said that, most synthetic tents that are only a few years old should retain their waterproofing until they are at least five years old. The seams might leak a little but you can always apply seam sealant.
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Topic: Aspen 700 Rewaterproof my tent
