Plumbers putty and thread sealant serve entirely different purposes and cannot be used interchangeably in plumbing installations. Plumbers putty is a soft, pliable, clay-like molding compound used exclusively as a waterproof filler and barrier underneath non-pressure fixtures like sink strainers, faucet bases, and basket flanges where it is not subjected to internal water pressure. In contrast, thread sealant is a liquid paste or tape applied strictly to threaded pipe joints to seal against high internal water, gas, or oil pressures. Putty relies on gravity and weight to stay in place, while thread sealant cures or compresses to withstand heavy forces.
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