Silicone resealing: the ninety-minute job everyone quotes at thirty
Blackened silicone around a shower tray or kitchen sink is probably the most common small job in UAE bathrooms, and it is also the most commonly botched, because the visible part (running a new bead) is the quick part. The job is really a removal job. Every trace of the old sealant has to come out: cut free with a blade, scraped, then the residue dissolved or abraded away, because new silicone will not bond to old silicone and any mould left in the joint grows straight through the fresh bead within months.
Then comes the part no one budgets for: cure time. Sanitary silicone needs roughly 24 hours before the shower runs again; using it the same evening washes out the surface skin and the bead fails early. A full shower enclosure reseal is 60-90 minutes of work plus that day of patience. Quality check a week later: the bead is uniform width, bonded on both edges with no lifting corners, and water sheets off it rather than creeping underneath.