Choose the sealing material for the exact sink, drain and putty formulation. Ordinary oil-based putty can stain porous materials, while a specifically approved stain-free product has different limits. Oatey's current stain-free putty permits PVC and most plastics but excludes ABS. The fixture maker can require another seal or gasket; do not treat every tub of putty as interchangeable.
Separate ordinary putty from a named stain-free formulation
Identify both surfaces and the actual sealing product before setting a drain or faucet. A recommendation for plumber's putty on one sink does not authorize every formulation on every plastic, stone or finished surface. Keep the sink and drain instructions together with the container label.
Oatey's current putty guide distinguishes its regular oil-based product from its stain-free product. Oil from ordinary putty can discolor compatible-looking porous surfaces. A product described as stain-free still has application limits; the name does not establish permission for every drain part.
The cited Oatey Stain-Free technical specification permits PVC and most other plastics, but explicitly excludes ABS. It also identifies natural surface materials, including granite, marble, quartz/sandstone and Corian. Those are instructions for that specific formulation, not a universal approval of every putty or every sink.
Check the fixture's sealing instructions too
Identify the bowl material, any surface coating, the drain flange and the parts that will touch the seal. A manufacturer can specify silicone, a supplied gasket or another method. Confirm compatibility with both makers instead of choosing only by whether the compound stays soft.
Kitchen sink installation covers the surrounding assembly. Replacing a leaking basket strainer is a separate repair task. This page resolves which material is permitted at its seal, not how to tighten every strainer.
Keep it out of other kinds of connections
Oatey's guide excludes pressurized connections and pipe threads from plumber's-putty use. Slip-joint washers, supply connections and threaded seals have their own sealing surfaces or specified products. Putty outside a leaking connection does not substitute for repairing it.
The stain-free specification also warns against mixing it with normal grades of putty because staining can occur. Do not combine leftovers, add oil to soften a product, or assume an old unknown bead identifies what should replace it.
If a stain or leak has already appeared
Record the products used, photographs and the date of the work. Ask the sink and sealant makers for the appropriate cleaning or replacement advice before using a solvent on the finish. A persistent leak can require reseating or replacing the actual seal, rather than adding compound outside it.
Sink material selection explains other material differences. Resolve the documented compatibility and final leak check before returning the connection to use.