Thermochromic paints - 3 colors and 5 temperatures
Amazon.com : ATLANTA CHEMICAL ENGINEERING Temperature Heat Activated Color Changing Paint Thermochromic RED changing COLORLESS (translucent white) at 88 ⁰F : Arts, Crafts & Sewing
Thermo Spray - www.service.european-aerosols.com
THERMO-TEC Header Paint (Copper) – Race Tools Direct
PFP - Thermo-Lag 3000 P - Intumescent hydrocarbon fire protection - Plural spray | PaintDeals.com