Tucano Urbano lap cover air bladders

Some of the Tucano Urbano lapcovers come with inflatable air bladders in the sides to keep them stable and stop flapping at speed. One of mine has got a pinch puncture in it. Anyone know the best way of fixing this? A bicycle puncture repair kit didn’t want to stick to the synthetic rubber material. I’ve used a bicycle patch and evo stick and it seems to be holding up so far.

this might help

Bicycle patch and evostick seems to have worked. It’s held up for 2 weeks now with no loss of pressure. And it’s nearly time to remove it and revert to estate agent sign.