Temperature Markers are specifically formulated for marking surfaces that are exposed to extreme high temperature environments. Marks should be made at room temperature and can be applied to almost any non-porous surface such as metal, glass, and ceramic. When marking on ceramics, the marks will become permanently fused to the surface after heat is applied. The paint is designed to permanently write on dirty, oily, greasy and rough surfaces The specifically formulated oil-based paint dries in 25-30 minutes When dry can withstand temperatures up to 1093 degrees