I don't have any experience with Double Tap Sports targets, but I do have a ton with the Norwegian waterproof targets, and they f78king rock. You can shoot one, stick it in a barrel of water for a year, pull it out and use it. Not sure if they make IDPA targets or not though, but with a big enough order they likely would. They ship everywhere.
Kongsvinger club in Norway had two targets setup at the entrance to their range back in 2010 when I was there, one shot one virgin. They were still there 4 years later, they had faded, and drooped a little bit, and a couple patches had finally fallen off. But for the first couple years they looked nearly new despite years of rain, snow, wind and sun.