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Yeah, not cleanest glue job. Probably a combination of factors: My second glue job, and the fact that the sprinters fit really tightly on those rims. I did flat the rear after my first glue job and it took me about half an hour to get it off so I think I did something right.
The rims are clean, it is just the sidewalls. I wasn't as careful the second time and worked a little quicker with the last coat hoping the Mastik One would be a little wetter than the first time. Instead I got a few thicker spots the burbled out and also smeared some glue on the sidewalls wrestling the tire on.