You don’t often see photographers using gels outdoors in natural light, but why? I think one of the core reasons you don't see too many natural light gel shots, is that you need a lot of power and control from your lights to make color gels visible in daylight.
There are unfortunately times when technology just lets us down. It’s not always because it inevitably breaks either: sometimes it is simply because every piece of gear has its strengths and weaknesses, and flash triggers are no exception.
At first glance, it seems like an easy thing to achieve: how hard can it be to get a great looking gelled background in your portrait?