Jet Cem Fast Setting Repair, Rapid set cement The best cement-based product for when a quick repair job is required is Jetcem Rapid Set Cement, which is specially developed for rapid patching and repair solutions. Ever build with its powerful qualities, Jet Cem rapid set cement can patch holes and cracks up to 25 mm wide in brick, stone, and concrete substrates. Both interior and external repairs are appropriate The best remedy for cracks in walls, flooring, kerbstones, pointing brick and stone, sealing leaks, and installing railings and posts is Jetcem Rapid Set Cement.