Your thoughts on splitting silicone...

[DHTiling]

Oh and thanks for the spell check Dave

...........

 

[slikt]

Slikt - Do you mean that you have had a similar thing when the area has been cleaned down with meths?

Once or twice, not sure if it was the make of Meths, or the silicone, too expensive to experiment with to find out. I try to always use Acetoxy silicone, never had issues with using this

 

[user123]

There could be a contaminent in the actual production of the bath and tray.Are they the same make??

This is what i was wondering, I dont know. I am going to have a word with the plumber tomorrow and find out if they are in anyway different to the norm. It just seems really odd that every joint in the room (there are a lot) is fine but the tray and bath joints have not taken... Strange.

Hmm. love questions like this... the other obvious repellent (there is a better word for it I can't think of right now, something beginning with 'r', but anyhow, to silicone is oil. Plastics are petroleum oil products...with I would assume with varying degrees of oil content? Are bath and tray plastic, Rich?

 

[jay]

So the silicone's debonding from the white goods .at a guess the customer has cleaned them with something witch has left a coating on the surface causing your silicone to fail as mentioned above acetone or a solvent on a clean rag will be needed ,make sure that you run a dry rag over all areas you use the solvent before re trying the silicone

 

[paul flight]

are the bath and shower against stud walls???

 

[tfs]

I came across this a while back and in some rare cases sanitryware need to be primed prior to sseling with a sealant.

The experience I had required the sanitryware to be sealed with Mapei's Primer fd before resealing the area with mapisil ac

I think some types of resins in certain baths and trays can be problematic in terms of getting a good bond.

To the best of my knowledge the primer fd is rather rare and had to be ordered from Italy or Poland.

hope this helps

 

[advancetiling]

google the window man. section on different silicone sealers high/low modulus etc.quite a good read http://www.thewindowman.co.uk/sealants.htm

 

[kilty55]

hi rich this happened to me using mapei silicone

check the sell by date as this was the issue with us
the siliconed curled up on tile and opposite surface and came away from the surface

out of date silicone was the issue

 

[Rich]

Thank you all for your help. The walls are plaster, the bath and tray have not been cleaned with anything and the silicone is in date. I went back last night, removed the ultra silicone and replaced with Mapei but Im not convinced that it will hold. It seems to me that tfs and Mosaic girl are on the right tracks, I had thought about a primer but on the tube of silicone they say that you need to prime with the FD on porous surfaces. Now I have used Mapei, I will be on the phone to them to see what the best plan of attack is. Thank you again all, I will keep you informed.

GO TF!!

 

[user123]

'Release agent' that was the term I was looking for - the release agents for silicone are not just washing up liquids are they, they are petrol based things like vaseline, oil, petrol, ... and it could well be in those plastics... yes, keep us posted, Rich..

 

[phillacey]

Re: Your thoughts on spliting silicone...

Hi Rich, was is a stone tile as silicone doesnt stick to alot of stone tiles very well ?

 

[Ger]

Was the protective surface liner fully removed across the full width of the ledge so as not to act as a silicone bond-breaker between the silicone and adjacent ledge that may cause de-bonding after cure shrinkage has occured?

 

[mz30]

Its the protective coating on the white goods that are causing the problem,there will be some sort of oily residue on it ,little bit of thinners or the like should remove it.
Thats why i never ,ever get involved in siliconing thats the plumbers job when he does his final fix lol

 

[Ger]

I have seen cases where installers use white spirits to clean ledges in preparation for silicone.

White spirits is oil based. You can imagine the consequences!

 

[Rich]

No the tiles are ceramics, as said above thinners is not much cop to clean down with as it can leave a residue. The areas were cleaned down with meths before the first lot of silicone was done (as this shouldn't leave any residue). The protective coating was removed.

Have had a look at the Mapei FD primer... :yikes: Wow!! that is expensive!

 

[tfs]

Have had a look at the Mapei FD primer... :yikes: Wow!! that is expensive![/QUOTE]

tell me about it:lol:

 

[SJPurdy]

I have this year had this problem on a few baths. The silicone i was using adhered to the tiles but pulled away from the bath. I tested two batches of this brand in white, and clear against every old scrap of part tube of other brands i could find in my garage; by applying a bead of each to a clean glazed tile. When set i found that some brands were firmly adhered to the tile and needed cutting off to remove them others were well adhered but could be pulled off; but the brand i had been recently using could be easily pulled off clean!
I have now gone back to more reliable brands and used up all my tubes of Ultra for filling air gaps around insulation panels in my loft.
Steve