An article published by NASA, June 1965 By John B. Schutt NASA TECH BRIEF Inorganic Paint Is Durable, Fireproof, Easy to Apply Potassium Silicate Stains are alkaline and higher in PH (11-12), Stable, Inorganic, (UV protected) and are Breathable. When applying any paints/stains to your masonry, the most important factors outside being aesthetically pleasing are: [...]