Faithfull FAIPST Plasterer's Scratching Tool The Faithfull Plasterers Scratching Tool with 7 prongs. The wire prongs are designed for scratching or keying interior and exterior plaster or render coats to ensure good adhesion of the second or finishing coat. FAIPST Specification: Type: Scratcher Size: 7 prong What is included: 1x FAIPST Plasterer's Scratching Tool