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Silicone on new sink waste?


MJNewton

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Use the lower seal and ditch the flimsy upper one.  Set the top metal part ( sieve ) in with some clear silicone ( I prefer clear CT1 / clear Stixall etc as it doesn't degrade like silicone does ) and clear the excess off immediately with baby wipes, lots of them, used once and discarded. Cutting off cured products afterwards risks scratching the metal and is a bit clumsy. 

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Thanks everyone - seems unanimous to use to use silicone for the top seal. 

 

1 hour ago, cherryfountain said:

I always found the Franke and Blanco kits to work well without any other sealants .

 

I must admit it wasn't a specific doubt about the quality of the kit - it all felt good quality but wondered even so about the benefits of a silicone seal. 

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10 minutes ago, Temp said:

For me the plastic top seal seems to leave the metal of the waste a bit high. With silicon you can get it nearer flush.

Yup. Biggest bug bear of mine with those is the gap which crud gets into. 
 

 

1 hour ago, cherryfountain said:

I always found the Franke and Blanco kits to work well without any other sealants .

Agreed. To be honest, if you follow the path that water would take, if it got under the top fitting, you’ll see it cannot leak out if the bottom seal is robust. The use of a sealant is more about keeping things from moving about tbh. 

 

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Just been back to the wastes to examine in more detail what washers/seals are provided. There's a formed rubber one for underneath that mates well with the underneath bits, and a thin foam one for on top. The foam washer doesn't make the plug hole sit proud as there's a fair recess in the sink, and without it it doesn't self-centre quite as well. What I think I'll do is dry-fit to start off with, or perhaps add silicone to the foam washer for good measure, but I don't think I'll leave it out.

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I should've uploaded a picture really as thinking about this it has dawned on me that not all sink wastes are the same.

 

Here's what I've got:

 

20201025_205054.thumb.jpg.8afccc7e3ced057c0408a5d52c5d4b6a.jpg

 

 

With the above-sink parts consisting only of a pressed plate (i.e. there's no threaded column that protrudes through the sink hole) it's clear that the watertight seal is actually a function of the rubber washer underneath the sink. If I was going to be putting silicone/PM anywhere *that's* where I'd be needing to put it but given the ridges on the washer I don't think it'll be required.

Edited by MJNewton
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If you silicone the foam washer, it’ll spread and splay out as you tighten up. ?. Either dry fit it, or don’t fit it, but not both. 

36 minutes ago, MJNewton said:

Here's what I've got:

 

 

With the above-sink parts consisting only of a pressed plate (i.e. there's no threaded column that protrudes through the sink hole) it's clear that the watertight seal is actually a function of the rubber washer underneath the sink..................but given the ridges on the washer I don't think it'll be required.

Correct.  Dry fit the whole thing and don’t over tighten. Should be fine without any help as that’s a good kit with the essential good rubber ‘under / bottom seal’. ?

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