Koolerant #3 - Kool Lube is a brand new 100% synthetic, biodegradable koolerant free of phenols, sulphur, chlorine, phosphates, nitrosamines, nitrates and oil. Mix Koolerant #3 with water (10:1 for soft and medium rocks up to 5.5 Mohs, and 5:1 for hard rocks and glass 5+ Mohs). This koolerant contains rust inhibitors which decrease rusting with this water-based koolerant.