when I first openned the roll of flotex cobles design I was met with a bright green glow on the patten that was not visible on the sample , Had it not been the Easter holidays it would have been sent straight back. but I laid it out to flatten & by next day the glow had decreased, I would have preferred the green not to have been there but I realised that it was activated by the sunlight & has calmed down over time only being visible with the sun on it, novel to say the least but I will live with it , my previos Flotex is over 30 years old with only a couple of worn patches it will live out its life in the garage . I find Flotex to be a wonderful product but cant remember it being so expensive relatively to alternatives back when I first bought it, there again at 78 years old everything is expensive these days anything I spend comes out of the kids inheritance after the taxman !!!