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Caulk
Definition
Includes caulks, wallboard mud, joint compound and spackle.
Disposal
Solvent-based caulk is flammable. Bring it to the household hazardous waste collection sites for free. Empty containers go in the trash.
Latex or water-based caulk is safe to put in the trash. If the label reads "soap and water clean-up," the product is not flammable.