Thermo-Shield uses special Acrylic Elastomeric Resins developed in conjunction with Romm and Haas, a leading, high-end resin supplier. Engineering the perfect resin to suspend the ceramic micro-spheres, while still providing excellent adhesion to most surfaces took years. Additionally, the resins needed to have a high tensile strength, be waterproof, and withstand the most extreme weather conditions. The Resins that were eventually developed for Thermo-Shield do all of this and more. The most unique quality of the resins is called "Variable Permeability". When conditions are wet, the resin polymers swell up, becoming completely water-tight. When conditions are dry, the pores open up, and trapped moisture can breathe out. This is very important. Other paint products are watertight all the time. Moisture will work up beneath the surface and become trapped under the waterproof material. When this moisture heats up, it turns water to vapor, expanding many times, causing blistering or destroying adhesion; or it freezes which also breaks down the adhesion, leading to paint failure.