None of the Schoeller materials are rated to anywhere near the same waterproofedness as a membrane/laminate-type material such as GoreTex or Event. In fact, I don’t think I’ve ever read any blurb by Schoeller claiming any of their fabrics are waterproof at all – merely water-repellant. That means they’re OK for short periods but won’t handle a sustained soaking.
Like I said, I’ve got some Schoeller stuff already (jacket and two sets of trousers) and they are marvellous, but I would never rely on them as my only waterproof layer if I knew I was likely to be out for several hours.