Dawn from Bay City, Mi. writes
The shelf life of Delta Dust is 3 years from purchase date. It should still be effective during that time period, as long as it was properly stored in a dry moderate temperature area.
Delta dust can last up to eight months when applied to undisturbed areas. It is 100% waterproof, so moisture will not decrease the efficacy of the product after applied.
Answer last updated on: 09/18/2013