DIY & Home Improvement

If you replaced the vanity and the moen faucet, there should be 3 holes to place the new faucet. How can there be a space you need to caulk in your vanity/counter? They are factory made to fit.

Of course you can slather it with silicone, but everything is new and there should be no space for water to drip through. Faucets now require no plumbers putty or anything else like silicone.

What am I missing?

If you are talking about the p trap assembly leaking, you may have missed putting in one of those Teflon rings. Put each one in the right direction, and tighten them until they don't leak.