Re: So I bought Action Movie essentials...

well, the technique would apply to footage too. Of course, making it work where it goes in one direction is tricky, but you can use a couple of layers of it offset so that the begginning of one offset is in the middle and carries you to a loop point.

In other words, if you start the first one at the beginning and set the end of the second one so that it ends at 25 seconds, and blend between them in the middle, it should fix your time issue without screwing up the timing of the fog. To carry this further, if you start the fog layer at say two seconds in, then overlap the layers so that that two second mark repeats at the twenty five second mark, you have a loop...

hope that helps.