Can I replace a 2cm patch of sealant in the shower...

[WhatWouldTheDoctorDo]

...or do I have to remove and redo it all?

Some over vigorous cleaning of the shower (very unlike me) meant a small strip of sealant has come away. Any expert diy-ers know if I can just replace that patch or do I need to remove it all and re-do it? If I can psych it, and tips or recommended products?

TIA!

I’d just go over it with that Unibond sealer stuff - you can pick it up in the supermarket. Really easy to use

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I'll have a look, thanks!

The sealant is really easy, you just need a tube of it and a plunger-gun thing. Check out a YouTube video on it

I re-sealed a shower where a small area of sealant was leaking. All the advice I found was to replace the whole lot because you need to make an effective seal between shower tray or screen and wall. Patching it up doesn't do that - you're applying sealant to a seal which doesn't work. Plus it all needs to cure in one go.

Silicone won’t bond to dry silicone- it needs to be wet. Like wowfudge said, your best bet is to just pull it all out now and start again.

Useful tips: use toilet paper to dry the area completely. Silicone won’t bond to wet surfaces (but will bond to wet silicone!)

Use a sharp (Stanley) knife to cut the silicone nozzle at an angle so that the silicone gets allowed out at the thickness that suits your gap. Also by cutting it at an angle (around 30 degrees or so) you will have a nozzle that pushes the silicone into the gap if you angle the gun. When you pull the trigger keep the pressure even and make the movement fluid (make sure nothing is in your way).

Once you have squirted your line of silicone along, use a water spray to spray water mixed with a very small amount of fairy liquid so that the area around the silicone is now damp (it can go on top of the silicone). This will stop the silicone adhering outside the line you’ve made. This will make for a neater finish.

HAVE TOILET PAPER ON HAND BEFORE YOU WIPE THE SILICONE.

Run water on your finger then run it down the silicone. If your finger is wet then it will glide over the silicone and push it into the gap making a good seal. Any excess wipe off your finger with toilet paper. Re-wet your finger every time before you wipe the silicone.

That should land you with a nice neat clean seal. If it’s in a bathroom make sure to buy anti-fungal silicone.

We cut out a small rough section that had gone mouldy and splodged in some new and you can hardly see the join. Just make sure it's a clean edge and no grease or muck in sight!

Ok, thanks everyone. Sounds like re-doing the whole lot make sense, which I was hoping to avoid. ☹️