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:
* UV Protected (Acrylic/Lime will fade)
* Alkaline (Prevent Mildew/Algae) PH Higher than 8 (11-12)