Acoustic seal is great and you can only get a better result by using it on every joist and both top and bottom plates...that is if your goal is to keep air out/in. It can actually be overkill and cause other problems in houses like attic rain. So the question is, is the detached garage heated? It might be better to not use sealant and allow for some air transfer...especially if you are bringing in big, hot, snowy cars all winter. Or if you're planning on using a space heater with no make up air return it might be better to not be super sealed. I'm not sure about that but just something to consider.
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