plumbing vent seal repair?
One of my rooftop plumbing vents had the lead water-seal sleeve nibbled by rodents. So the lead isn't folded over the top of the vent pipe anymore, leaving a small gap between the lead sleeve and the PVC pipe.
I could take some time and replace the whole dang lead seal, pulling up a bunch of roofing tiles, or I could just fold some sheet metal over the gap to keep the rain out of my attic. Lead, copper, aluminum foil, whatever. Just form a foil cap, big puncture in the top of the cap to allow ventilation, and fold the foil inwards.
Why shouldn't I do that? In fact, if I don't use lead foil, the critters probably won't nibble it any more.
I could probably just squirt the gap full of RTV sealant, but that would probably just make it hard to do a full replacement of the sleeve someday.