Bayko builder kits Just to make a correction. Bayko was predominately plastic mouldings with metal rods and tie bars. No water souble mortar was ever needed. However, there was another building set that was called something like Junior Bricklayer. This had tiny clay bricks that were laid on a blueprint using a flour and water type mix. Once the building had been made and 'admired' for a couple of weeks, the whole thing could be soaked in hot water for an hour and the bricks could be dismantled, washed and used again for the next project.