I agree with Sailingdog on the issue of breath-ability that needs further investigation. I think the weight issue is perhaps not so important after all, these things are locker bound when underway are they not? Furthermore, the product can be thinned and sprayed on it appears. As for UV, my initial point was that the UV damaged the colour but not the fabric itself. I'm not being overly miserly, it's just that it seemed a shame if not environmentally wasteful to dump covers simply because of the fading. I wonder if the once breathable Sunbrella could be ventilated with vent studs to make up for the plastic tool dip solution?
It is nice to see such interest in my humble question. I do however view the option of simple replacement as simply 'giving in' and not improving the 'status quo'. Having said this, I think those that buy white covers initially, buy wisely indeed!