Also, never use steel wool or a wire brush to clean glass block, because they will cause scratches. In this method, the previously described procedure for mortaring glass block is combined with plastic connectors to produce a structure of improved rigidity. The connectors also aid in alignment and spacing of the blocks, resulting in a more professional-looking job. Because all of the blocks rest on the connectors, there is no problem with the upper courses squeezing and mortar out of the lower courses. This enables you to work at your own pace, without constantly stopping to wait for the mortar to set.
Plastic connectors are available to fit all sizes and thicknesses of glass block.
If you're planning a curved wall, tapered connectors are also available. Because T-shaped connectors are nailed or screwed in place, they serve as additional anchoring devices. When placing T-shaped connectors prior to setting the first course of blocks, mortar them in place to prevent slippage. Once the first course has been installed in the joints and mortared down as part of the mortar bed for the next course. Use a rubber mallet to tap each block down so that it fits tightly on the connectors below.