Roofing grade asphalt emulsions are typically designed for film formation, adhesion to common building substrates, and water resistance after cure. Desired properties include consistent solids content, workable viscosity for brushing, rolling, or spraying, and durability under thermal cycling. Many systems also rely on compatibility with reinforcement fabrics and topcoats. For real suitability, buyers should check data on dry film build per coat, crack bridging or flexibility, ponding water resistance where applicable, and cure time under typical site conditions. The most important metric is cured residue performance, not only emulsion stability in the pail.