I have 150 K26 soft bricks that have been drilled through with about a 5/8-inch hole on the broad side of the brick. I want to fill the holes and then reuse these bricks. Does anyone have a recommendation on what type of material/product to use? I have looked online and see that there are fillers intended for repairing small kilns, but these products are packaged in small amounts - too small - and by the time I'd buy it I'd have spent more than I'd be saving by salvaging the bricks I have. The bricks are to be used for a lid for a wood fire train kiln. The first design is failing and has to be