can you apply silicone over silicone?

[mutley racers]

Is it possible, say, when you have a leak around a basin, bath or shower from a hole in the silicone. Can you apply a bit on top to cure leak? Or, do you need to renew the whole seal?

 

[Guest123]

You can if it's only a small leak. If the leak is at the edges where the seal is made, it's best to rake it all out with a knife and silicon remover and redo it. If silicon is leaking at any point, my preference is to renew the lot.

 

[mountainman]

Possibly, if the existing silicone is clean enough for the new silicone to stick.
I've always favoured removing the old stuff and renewing the lot.

 

[mcniven]

if its just a small bit of mould or old silicone i would!!

 

[SimonG]

Prefer to start again, especially if it's not your original job then it makes sure it's done right. Because after your visit any leaks are down to you

 

[mutley racers]

i hate moving silicone! It can be a laborious job. I bought some of that silicone remover stuff and find it works quite well

 

[PlumbBobBob]

i'm with everyone else, best job is to remove all of the silicone and redo it.

 

[JCplumb]

As SimonG stated above, it's down to you if it continues to leak so spend 1/2 an hour(chargeable) to remove the old stuff and redo it.

 

[garyplumb]

Silicone doesn't stick to silicone, remove and replace

 

[Guest123]

On the subject of silicon, a polysulphide based mastic is far better as it seals better, remains more flexible and sticks to anything if the correct brush on primer is used. It can also be used outdoors and the sheet lead sealant you see on sale is this stuff.

Somtimes it can be a pain in the botty to get silicon to adhere to aluminium on some shower frames. Tool station sell the poly stuff.