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In practice they describe the same trade. 'Caulk' usually means a paintable acrylic used internally on skirting and architrave; 'mastic' or 'sealant' generally means a flexible silicone, polyurethane or hybrid used where the joint has to move or keep water out. We select whichever system suits the joint, the substrate and the exposure.

A correctly specified and correctly prepared external joint should give 15–25 years. Internal sanitary silicone in a well-ventilated bathroom typically gives 5–10. The overwhelming majority of early failures we are called out to are down to preparation or the wrong product, not the sealant itself.

Regularly. Hotels, schools, hospitals and offices are often sealed in phases, out of hours or overnight so the building keeps running. Tell us the constraints and we will programme around them.

Mould growing inside a silicone bead cannot be cleaned out because it is rooted in the sealant. The only lasting fix is full removal, thorough cleaning and drying of the substrate, then resealing with a fungicidal sanitary-grade silicone. We will also flag the ventilation or movement issue that caused it.

Both, depending on the job. Repeatable measured work such as plot packages, cladding runs and floor joints is usually priced per linear metre. Remedial, snagging and access-heavy work is generally day-rated. Either way you get a fixed written price before we start.