needle scaler

I didn't make it to the city yet, hopefully next week. will go by HF and get one. the car is a 67 Bel with 50 year old rust and just undercoat in places like wheel wells ,under fenders. rock hard! otherwise surface rust if would like to clean best I can, then I will treat it with Ospho, and later shoot some epoxy , tractor paint, and undercoat the whole bottom. driver!