I have a conventional built-up flat roof on a concrete deck with dozens of blisters, nearly every single seam in bad condition, and water infiltration at at least one (probably more) penetrations including the bathroom exhaust fan duct shown in the last two pics. As badly as I'd love to have it torn off and completely replaced, I can't afford an $8,000 repair right now, period, and have no choice but to fix it up as best as I can so I can defer the full replacement for another 4-5 years. I've gotten the impression that there's at least one repair process that's DIY-friendly, but will leave the roof in a state where it basically can't be repaired further, and nothing short of a full tear-out will be possible going forward (kind of like blowing emergency repair foam into a flat tire... it'll get you back on the road immediately, but a tire temporarily fixed with it has to be replaced because the moment you blow it into that tire, it becomes permanently irreparable). I *think* it involved a product with the word "cement" in its name, but I'm not really sure. Keeping that in mind, is there any product available at Home Depot or Lowes that can be used to seal blisters that have been cut open and dried, and re-seal seams that are coming apart, that a) won't render the roof irreparable going forward and mandate a complete tearout the next time the roof leaks b) at worst, might need to be re-applied if it rains too soon after use (as opposed to, "If it rains too soon, you'll end up in worse shape than if you'd done nothing at all"). 'B' in particular is vital... at this time of the year in Florida, there basically IS NO day when it truly doesn't rain at all, and you could confidently know that it wouldn't rain at all earlier in the day. A "dry" day is one with scattered light showers. A "rainy" day is one where there's a mid-afternoon mini-hurricane with 3+ inches of wind-driven torrential rain and the roads all flood... Some roof pics taken this afternoon (1=facing west, 2=facing east, south side of roof, 3=facing east, 4=facing west, north side of roof; 5=master bathroom).