Weldcote Solar Flux Is A Complex Chemical Compound In The Form Of A Very Fine Powder. Weldcote Solar Flux Is Mixed With Alcohol And Brushed On The Back Of The Weld Joint. It Is Formulated To Shield The Back Of The Weld Joint From Oxygen, Dissipate Heat And Unwanted Oxides, And To Clean The Surface Of The Metal. It Will Aid In The Flow Of Filler Metal Over Base Metal And Form A Protective Barrier To Prevent Re-Oxidation And Heat Scale. Type B Is For Welding Stainless Steel And Alloy Steels. Weldcote Solar Flux Type B Can Be Used For Pipe And Tube Welding, Maintenance Welding, Infield Welding, Certain Specified Aircraft Airframe And Jet Engine Repairs For All Shapes And Configurations. The Shelf Life Of Type B, That Has Never Been Mixed Fluid In The Closed Can, Is Infinite.