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Glue for SMD part - each SMD is glued to PCB before soldering - without glue it simply fall from PCB (valid for wave soldering - when IR and similar methods are used for soldering glue in theory is not needed - solder past should be enough but anyway glue is used sometimes, also glue is required for two side component populated boards for bigger SMD, small ones are stay due of solder own surface tension)
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