as subject suggests, i have gloss paint outside (windows, soffits, etc) that is no longer glossy as it's been exposed long enough. Does this still need sanding? I'd thought I'd scrape any loose paint (really not much loose). Is a wire brush a useful thing? Can I get away with just a washing down with sugar soap? Also, what's the norm here, an undercoat and two coats of gloss? Just one coat of gloss? Would a primer rather than undercoat help ensure good adhesion? Many thanks