Yeah so often sleet co ck blocks the glazing potential. It's kind of hard to get a nearly pure freezing rain event, as it seems to be more fleeting/transitory in nature in these parts.
The best ice storm I've witnessed was back in December '94 while living in the QC. We were forecast to get a warning criteria snow event, with freezing rain changing to snow. To my dismay at the time the freezing rain just kept holding and didn't change to snow until the final portion of the event. Didn't have online models to peruse in those days, so had to rely on TWC and weather radio.