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.

 

[WaterTight]

Silicone doesn't stick to silicone, remove and replace

Surely this is nonsense. The silicone molecules in the middle of a line of silicone which is at neither end, and therefore not spending it's time sticking to, say, a shower tray or row of tiles, must be spending it's time sticking to other silicone molecules.

Anything sticky must stick to itself as the very minimum on a list of what it sticks to. It is part of what it means to be sticky. I'm aware I made my point moments ago but cannot seem to stop saying the words sticky or sticking.

 

[fuzzy]

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?

only if you put enough on, id go for 3 or 4 tubes of it

 

[mutley racers]

ha ha, 3 or 4 tubes. I think i shall just replace the whole seal then

 

[Muse2k8]

Surely this is nonsense. The silicone molecules in the middle of a line of silicone which is at neither end, and therefore not spending it's time sticking to, say, a shower tray or row of tiles, must be spending it's time sticking to other silicone molecules.

Anything sticky must stick to itself as the very minimum on a list of what it sticks to. It is part of what it means to be sticky. I'm aware I made my point moments ago but cannot seem to stop saying the words sticky or sticking.

When wet and active then yes but silicone drys to have a very non sticky and repellent surface. If it was still able to bind then the very waterproof properties it's used for would be null. As it dries it reacts with itself and bonds to surfaces tightly (hence why it's a pain to remove) but once bound she shall be sticky no more.

But I did enjoy your sticky post lol.

 

[WaterTight]

Hmm. Tiles are a very non-sticky and repellent surface aren't they? As are bath-tubs and basins. I'd wager if you took a ball of cured silicone and squished together with a ball of fresh silicone and let it set you'd be hard pushes to separate them. But I've not done this experiment so maybe you're right. I do distinctly remember my old boss telling me you could apply silicone on top of old silcione. And he did know what he was talking about on most things.

 

[Guest123]

Well you can't teach an old dog new tricks so I'll "stick" to the way I've always done it.

Instead of silicone why not melt lead into it........

 

[Muse2k8]

I have a spare tube of silicone actually. Might do a wee experiment

 

[mutley racers]

well, this has turned out to be an interesting thread. I ma excited to see what the out come of someones experiment is. But, no matter what the out come, I shall always strip the lot and replace. After all, the client pays for the first hour whether it's 10 minutes or 60. The full replacement is the better job

 

[Muse2k8]

Just gotta leave first lot to dry out then I'll try on a second bit

 

[SimonJohns]

http://www.polyseamseal.com/pdf/tech_100-silicone.pdf

With reference to limitations.

 

[Guest123]

There's a good use for all them damn flexis......just glue them round a shower cubicle.

 

[Muse2k8]

Silicone dried for 24 hours then another blob added. Also pressed some in hard at the other end but 2 pics is enough

Will test its stickiness tomorrow night but I guess it's worth noting that the silicone hasn't exactly been attached to a bath or anything for years.

 

[Dannypipe]

A definative answer beckons. The excitement it almost too much

 

[Dannypipe]

Sad thing is, I really want to know!! My money is that it sticks well.

 

[WaterTight]

*drumroll*

 

[mutley racers]

i cannot wait any longer,. its so exciting

 

[Muse2k8]

Hold on to your hats guys this rides going to get wild!

 

[mutley racers]

come onnnnnnnnnnnnnnnnn

 

[galaxy_plumbing]

good you haven't started betting

 

[Muse2k8]

Let's get our answer...

 

[Muse2k8]

Well on silicone only a day or two old even a new batch doesn't adhere well. It didn't exactly drop off, was stuck on but wasn't a good reliable bond.

BUSTED!!!

 

[JCplumb]

At last!
Thanks for putting us out of our misery

 

[Muse2k8]

Well I never post but when I do it's got to be interesting lol

 

[mutley racers]

Well done muse, that is that myth busted.

 

[stevetheplumber]

Surely this is nonsense. The silicone molecules in the middle of a line of silicone which is at neither end, and therefore not spending it's time sticking to, say, a shower tray or row of tiles, must be spending it's time sticking to other silicone molecules.

Anything sticky must stick to itself as the very minimum on a list of what it sticks to. It is part of what it means to be sticky. I'm aware I made my point moments ago but cannot seem to stop saying the words sticky or sticking.

silicon will not stick to cured silicon is what should have been said and the surface begins to cure very fast so even trying to go over whilst applying is difficult