Yes glass beading (or other media blasting) can leave a high degree of surface texture/appearance variability depending on the type/size/pressure of the media. I avoid blasting in my process if at all possible but some really rough examples (i.e. these 409 carbs) will require it. In this case its only one of several steps used to revive the factory look (vibratory finisher, sonic cleaner, tumbler, etc.).