1. Apply to clean all types of metal polishing and corrosion protection. 2. Allow the metal to re-distribute shiny luster. 3. Simply spread on the surface and then gently polish. From GS custard: excellent quality trustworthy! Durable, reliable, good, GS custard plated crystal production has many years of history, so you can say this: each of us a plated crystal products have stood the test and validation.