Peeling, mouldy or gappy silicone around a bath, shower or basin is one of the most common jobs UK homeowners face — and one of the most tempting to tackle yourself. A tube of sealant and a smoothing tool look cheap and simple, so should you reseal the bathroom yourself or bring in a professional? The honest answer depends on the state of the joint, the finish you want, and how much mess you can live with if it goes wrong. Here is how to decide.
The Case for DIY Bathroom Silicone
For a small, straight, easy-to-reach joint in good condition, DIY resealing is entirely doable. If the old bead is sound and you simply want to freshen a short run — say around a basin — a careful homeowner with a steady hand can get a tidy result in an afternoon. The keys are removing every trace of the old silicone, drying the joint completely, using a good-quality sanitary-grade sealant, and tooling the bead in one smooth pass. Rushing any of those steps is where most DIY jobs start to unravel.
Where DIY Resealing Usually Goes Wrong
The problems rarely show up on day one — they appear a few weeks later. The most common issues we are called out to fix are lumpy or wavy beads, silicone that will not stick because the surface was damp or dusty, and black mould creeping back because old sealant or residue was left behind. Long runs along a bath, internal corners, and awkward gaps against tiles are genuinely tricky to tool neatly, and a poorly finished joint doesn’t just look bad — it lets water track behind the bath or worktop, which is exactly the damage sealant is meant to prevent. If your first attempt already looks messy, trying to patch over it usually makes things worse.
When It’s Worth Calling a Professional
Some situations tip the balance firmly towards a professional. If the joint is long, the corners are complex, the previous seal failed and let water in, or you want a crisp, showroom finish that will last, it pays to have it done properly the first time. Professionals also spot the underlying cause — movement in the bath, a gap that is too wide for a single bead, or hidden water damage — rather than just skinning over the symptom. Our mastic and sealant services cover baths, showers, wet rooms, kitchens and worktops across London, and we handle the full removal, preparation and resealing as one clean job.
What Professional Resealing Actually Involves
A typical reseal is a same-day job. The old silicone is cut out and every trace removed, the joint is cleaned and dried, the area is masked for a razor-sharp line, and a fresh sanitary-grade bead is applied and tooled to a consistent profile. Curing usually takes around 24 hours before the bath or shower should be used, so the surface has time to set fully and bond. Where resealing reveals a cracked or chipped surface underneath — common around older acrylic baths — that can often be repaired in the same visit rather than replacing the whole unit. If you have a damaged bath surface as well, our acrylic bath repair service restores chips and cracks without a full rip-out.
The Bottom Line
DIY makes sense for small, simple, well-prepared joints. For anything long, awkward, mould-prone, or already leaking, professional resealing gives you a durable, watertight, clean-looking finish and removes the risk of doing the job twice. Cost depends on the size of the job, its condition and access — rather than guess, send us a couple of photos of your bathroom silicone and we’ll give you a fast, no-obligation quote.
Not sure whether your bathroom silicone needs a refresh or a full reseal? Send us a photo for a fast, no-obligation quote and we’ll advise the best fix.
