Corona is an EIFS applicator. EIFS is a type of building exterior wall cladding system that provides exterior walls with an insulated finished surface and waterproofing in an integrated composite material system. Although often called "synthetic stucco", EIFS is not stucco. EIFS is a lightweight synthetic wall cladding that includes EPS foam insulation (Expanded Polystyrene Insulation) and thin synthetic. Corona applies stucco as a durable, attractive, and weather-resistant wall covering. The traditional application of stucco and lath occurs in three coats - the scratch coat, the brown coat and the finish coat.