Protective composition and method

An improved method of protecting a substrate against high temperature corrosion, which method comprises:

• a. forming a liquid-containing mixture comprising
• (1) about 18-22 parts by volume of ceramic glaze material in powder form, said material comprising a mixture of the oxides of silicon, aluminum, sodium and calcium, together with the oxide of at least one of magnesium, iron, titanium, potassium, lead and boron
• (2) about 90-110 parts by volume of adhesive comprising thermosetting phenolic resin in a solvent
• (3) about 9-11 parts by volume of high temperature paint powder comprising thermosetting resin selected from the group consisting of polyester resin, epoxy resin, acrylic resin and a mixture of polyester resin and epoxy resin, and a coloring agent and,
• (4) about 10.8-13.2 parts by volume of leveling agent comprising at least one of organo-modified clay and thermosetting silicone-containing resin,
• b. applying said mixture as a layer of desired thickness on a clean substrate to at least partially cover said substrate;
• and,
• c. curing said applied layer at at least about 150.degree. C. for at least about 1 hour until said layer is thermoset to a corrosion resistant, hard, dense, fire resistant, flexible protective covering.