Images for illustration purposes onlyWatco Flowpatch Sub Zero is ideal for concrete floor repair in cold rooms. It will cure very rapidly to withstand heavy traffic, even at -20C. Ideal for repairing holes or leveling damaged concrete floors. Recommended areas of useCold storesSecuring railingsPoles and postsRoads and manhole framesFeaturesEasy to use, just add water, mix and applyMagnesium-based formula generates heat when mixed with water, allowing the product to be used as low as minus 20CNon shrinkingStarts to harden in 10 minutes, fully hard in 5 hours when suitably insulated (at minus 10C) Can be applied at 50mm thick at minus 20C