sealant on bath and basin wastes

[Jupiter01]

As per many youtube videos, I use a bead of sealant on the underside of the tap and waste fittings. When doing this, presumably, I have to wait 24 hours before testing the water and waste? I ask, as in the videos the plumbers proceed with the testing immediately after fitting i.e. when the sealant is still wet

 

[John D v2.0]

You can use plumbers putty on the waste which doesn't dry or set, so it's up and running straight away
https://www.mrcentralheating.co.uk/plumbers-mait-750g

 

[Madrab]

No issue with using it straight away as long as it has sealed up. I usually do the waste etc first before the basin gets fitted so the silicone has had some time to cure, or leave it a quick 15mins to skin over.

 

[Jupiter01]

but wouldn't the sealant be ineffective if it comes into contact with water within 24 hours?

 

[Madrab]

Nope, As long as the waste with the silicone is watertight then water won't get past the seal as it isn't water soluble. Only acrylic sealant (caulk) is water soluble.