are you getting bubbles because your icing is not jammed together in your piping bag properly? or maybe after you have mixed it up there are bubbles in the icing? i have been doing a bit of flooding lately and have not had this problem, so am curious as to why it is happening so i dont come across same problem if i did i would definitely do as above have a pin on standby! and work quickly
Also make sure you are not overbeating the icing. That can cause air bubble to accumulate. After mixing, I put a damp kitchen towel over the bowl (so the royal icing doesn't dry out) and let the icing rest for about 10-15 minutes. The air bubbles that has accumulated during the beating process will rise and I take a rubber spatula and use the flat end to run over the top of the icing so the bubbles will pop. Also when I am done flooding, I give the cookies a good tap on the counter and pop any bubbles I might find. HTH
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