Resealing is maintenance on a roof that is otherwise sound: renewing the sealant at seams, edge trim and openings where the existing material has cracked, lifted or dried out. It is not a fix for water already inside the deck, or for a membrane that has failed across an area.
The decision turns on three things — the roof material, the products already applied to it, and whether the damage is at the surface or underneath. A localized reseal, a full coating and a membrane replacement are different jobs with different preparation, materials and expectations.
