Liquid Aluminum Radiator and Heater Core Stop Leak. Liquid Aluminum is part of the next generation stop leak line which not only seal leaks, but also conditions the system. USE WITH ALL TYPES OF TRADITIONAL OR EXTENDED LIFE COOLANT: Including yellow, orange, pink, red, blue, purple and green silicate based & non-silicate based (OAT/HOAT) 50-50 mix antifreeze, and/or water.