Oil Resistant Jointing Paste (Heldite) 250ml. Heldite is a liquid compound which seals screwed, bolted or flanged joints preventing leakage of oils, petrol, hydraulic fluids, water, steam, gases, coolants & fuels (excluding ethanol), waterproof & unaffected by sea water. Also used for protecting electrical joint boxes & moisture sensitive instruments. Applicator brush in cap. Heldite is not compatible with ethanol or potable water. Temp. range : -40 to 350°C.