Basin Overflow Issue

[ipbr21054]

We have a second bathroom which has a small basin sink.
I noticed that the overflow had water up to the level of the hole in the sink.
I removed the chrome waste fitting in the sink & noticed that there was no slot in it so hence why the overflow was full with water.
I have purchased the slotted waste and installed it into the basin.
I checked it the next day for leaks & there was a small amount of water passing the black seal on the underside of the basin when i run the tap.
When dry i added a little more silicone to the spot in question & left it to dry.
Next day seal fine but wet around the thread this time in the same area.
I removed the chrome waste fitting again,cleaned up the basin,removed all the silicone & started again.
This morning when i run a little water i noticed yet again there is a small amount of water in the same place as previous times.
I cant see how it is passing the black washer as i put a nice amount of silicone either side of it,not lots but enough to seal 100%
So am i correct in thinking that it is running down the thread if this is possible that is??
Please advise if i did something wrong or what the cause might be as this will now be the third time i will have to do this simple job.

Thanks.

 

[Hugh Jaleak]

See FAQ's, Number 3 by Chris R. : //www.diynot.com/forums/viewtopic.php?t=37170

 

[Phill Peck]

http://www.toolstation.com/shop/Plumbing/Washers+Fixings/Basin+Mate+1+14/d20/sd2703/p37534

Always use one of these available from DIY sheds and plumbers merchants

 

[Whitespirit66]

 

[ipbr21054]

I did watch the video but wish i didnt.
I will pop to b & q and buy this item.
It would of been helpfull if when i purchased the waste to be told that there is a good chance i would not be able to seal it.
I could of then bought the item and done the job once not 3 times etc.
Thanks very much for the advise.
I did think the thread was the issue but did not know how to fix it.

Cheers

 

[ipbr21054]

Just looking at b & q site
http://www.diy.com/nav/fix/plumbing...umbSure-Basin-and-Vanity-Bowl-Sealer-11478125

I assume i bin the black washer that i am currently using under the sink.
Use the 3 items on the b & q page and then use my black back nut to hold the basin mate in place.
I only ask as the video does not show using the foam seal which i assume is part of the b & q item.

Please just confirm.

 

[Whitespirit66]

I could of then bought the item and done the job once not 3 times etc.

That's why people pay us plumbers megabucks, to get it right first time.

 

[ipbr21054]

Megabucks wow,and you put the video up for me to watch

 

[Phill Peck]

Just looking at b & q site
http://www.diy.com/nav/fix/plumbing...umbSure-Basin-and-Vanity-Bowl-Sealer-11478125

I assume i bin the black washer that i am currently using under the sink.
Use the 3 items on the b & q page and then use my black back nut to hold the basin mate in place.
I only ask as the video does not show using the foam seal which i assume is part of the b & q item.

Please just confirm.

Foam washer goes between waste and basin on top them discard your black rubber and use the black rubber cone

 

[ipbr21054]

Item now fitted & no more leaks.
Thanks for the advice.

 

[Charnwood]

Thanks for the advice.

That's what the 'Thanks' button is for.

 

[ipbr21054]

please advise where the thanks button is

 

[Charnwood]

Top right corner of every post. Except your own.