Use of 100% silicone sealant

i'm going to be installing new faucets, bath sink and kitchen sink, kitchen bowls... Is it recommended to use silicone sealant
1) under bath pop-up drain
2) kitchen strainer
3) underneath the border of kitchen bowl
4) underneath the faucets

As far as I see, most of the above already have some sort of rubber gasket. Is it still necessary to use silicone sealant ??

THanks

Under the sink. Use plumber's putty under the drain. IF the other things have gaskets, they probably don't need any.

silicone

Do you ever intend to remove any of these? If so, silicone will make it either difficult or impossible, without a great deal of time and effort, and even then it would be a question if it could be done without damaging the sink or tub.

Gaskets don't work well.

I use plumbers putty on everything but marble and imitation marble so sometimes you may need to use clear silicone caulk. You may want to use a colored calk under a sink flange.

I agree with plumber1 about the plumbers putty. If you do use caulk don't use silicone because like hj said you will have problems if you have a problem and have to remove it. If you do use caulk you should not run any water for a couple of days to allow it to dry well.

thanks for the response...
i'll go with putty then....
If the faucets/sink drain/strainer already have rubber gasket, should I put plumber's putty underneath the gaskets ? Or should I take out the manufactuer's gasket ?

no putty should be added to purposefully contact the gasget. Putty goes on 1 side (top) the gasget on the other (bottom).

Can't use plumber's putty on granite, either.

Do what Cass said: Use plumber's putty only under the top portion of a lavatory pop-up, basket strainer, or garbage disposal flange, and use the rubber gasket underneath to make a good seal.

I never use anything but sink clamps to anchor a kitchen or lavatory sink for the reason Hj mentioned--it will be a bear to remove it when the time comes.

I've only used silicone to seal around a faucet once, because that particular faucet didn't come with a plastic base like every other faucet comes with.

Having said all that, I'm trying to find excuses to use the G.E. Bio Seal mildew-resistant silicone II product. It's the easiest caulk I've ever worked with. When you get it on your hands, 99.9% of it wipes off with a paper towel. So you only need to actually wash your hands once--after you are all done. When I use the cheap acrylic latex stuff, I find myself washing it off my hands all the time.

I used that stuff on my new granite countertops; worked great -- no muss, no fuss.