Put putty under outer edge of faucet base and fasten to sink. Remove excess putty after fastening faucet.
It sounds like you are installing a new faucet. If that is the case read the manufacturer's instructions. If you are re-installing an older faucet, using the plumbers putty doesn't hurt.
No. Use the putty.
If it is real marble, the oil in the putty can leach into the marble and discolor it.
You can use silicone as a substitute, but plumbers putty is simpler and far easier to clean up. 100% SILICONE
Oils from putty soak into and discolor marble. Putty not used when putting pipe together.
You use plumbers grease (non-toxic)
Normally you would use Plumber's Putty to seal the faucet to the sink. Some man made sinks can absorb the oil in the putty and darken in which case a bead of silicone caulking would work.
Plumbers Putty. An oil based putty that is used to seal sinks and faucets down the the cabinet and between the faucet and the sink. It takes years for it to dry out and it never shrinks or gets completely hard so it keeps a seal and is easy to clean off when something needs to be done with the sink.
Replace the trim plate gasket with a new seal or add plumbers putty. You may have to remove the faucets from the sink by removing the water pipes and nuts under the sink. Replace the stem seals on the faucet shaft if water is leaking out from under the handle. You may as well install new washers on the valve stems while you are on project.
The cost that plumbers charge to install a kitchen faucet can vary. As of 2013 the cost can range from $150 to $200. This cost does not include the cost of the new faucet.
pipes plunger putty
How to Install a Kitchen FaucetWhether replacing a broken fixture or as part of a remodel, follow these steps to install your new kitchen faucet.The first step is to choose the faucet that matches your kitchen decor. Always read the manufacturer's instruction concerning how to make the necessary connections. Ensure that you have all the required parts and tools on hand. The faucet should come with a rubber gasket to seal the space between the countertop and the faucet. If not, use plumbers' putty. Place the faucet in its proper location. Secure the faucet in place with the large plastic nuts using a plumber's basin wrench. Do not over tighten plastic nuts.Now use the appropriate length flexible supply line that has a braided steel covering to connect the water supply lines to the faucet. Make the connection to the water line first. Flush the line so sediment and debris don't reach the faucet. The flexible line has a larger connection on one end that attaches to the faucet. The smaller, 3/8th in. fitting connects to the water supply line.The next step is to connect the sprayer. Use the supplied gasket or putty to create the seal between the decorative ring and the countertop. Secure the ring in place with the washer and plastic nut. Slide the sprayer through the ring and connect it to the faucet. Test your new faucet. Use a bucket to catch the water if a drain line is not installed.