I come from a family where outdoors activities include picknick baskets and a time limit of four hours tops. However, my girlfriends family loves taking me on outdoor holidays, the kind where you won't see another human being for a few days. During last years holiday, my cheap coat was clearly insufficient to withstand anything more than a light Spanish shower, so they surprised me with a 'good' outdoor raincoat for our upcoming canoeing trip to Canada.
Usually, I sprayed my coats with some kind of water-proof spray before use to make it at least a little water- and dustproof, since 'you should always do that before first use'. However, this coat has some kind of high-tech breathing fabric that I'm not familiar with, and the labels did not provide any directions on whether (not to) spray the coat before first use.
So, my question: should I or should I not use water-proof spray on a 'professional' outdoors jacket? If yes, should I invest in a good spray from an outdoors shop, or will an all-purpose spray do? Or will this actually do more harm than good?
Specifically, it's Venturi ® fabric from Schöffel. Link to the coat in question (if that's allowed)