The Product Does Not Scratch, Corrode, Or Abrasie, And Polishes Surfaces While Protecting Them From Oxidation. To Use The Iosso Fiberglass & Metal Polish, Follow The Following Instructions: 1. Apply A Small Amount Of Product To The Surface To Be Treated Using A Soft Cloth. 2. Rub In Circular Motions Until The Paste Turns Black And Oxidation Residues Appear. 3. Remoe The Residues With A Clean Cloth Or Paper Towel. 4. For Maximum Shine, Go Oer The Surface With A Clean Cloth. It Is Important To Note That, Wheneer Possible On Metals (Gold, Siler, Brass, Copper), It Is Adisable To Perform A Pre-Wash With Soapy Water And Rinse. In Addition, All Iosso Products Are Made With Highly Biodegradable Surfactants, In Compliance With Ce Regulation 648/04, And Are Free Of Edta, In Order To Presere The Marine Ecosystem. Howeer, It Is Still Recommended To Aoid Unnecessary Excess And Not To Disperse Residues Into The Enironment. Remember To Perform A Pre-Wash On Metals (Gold, Siler, Brass, Copper) With Soapy Water And Not To Disperse Residues Into The Enironment.