Can I Soften Plumber's Putty in the Microwave?

Plumber's Putty

• Use plumber's putty to seal drains that need to be watertight. New plumber's putty is soft enough to use out of the bucket and will not need to be softened. Older plumber's putty is less soft, so you must make it easier to spread and stretch before you use it.

Microwave

• Since plumber's putty isn't supposed to be stored at high temperatures, keep it out of the microwave. The heat could damage the putty. It's also unsafe to heat plumbing chemicals in a place where food is prepared.

Ways to Soften Putty

• Roll a small piece of the putty between your hands to soften it. The warmth of your palms will relax the putty. If you're trying to soften old putty, pour linseed oil into an airtight container of putty. Leave it alone for a few days. It will be more pliable when you need to use it.

Caution

• Since plumber's putty contains oils, it will be absorbed into and stain porous surfaces. There are types of caulk and other materials you can use to create seals on surfaces like granite and marble. Store it in a cool, dry place for it to last the longest possible time.