In my experience, Tamiya's fluorescent polycarbonate paint does not adhere well generally; especially the fluor orange was poor for me. I never had the paint flake off right after painting, but it did happen to me within the first months of use. It was with a sanded inside, degreased, dried, room temperature, like other members here described as well. It may be a batch-to-batch thing, or possibly shelf life plays a role as well (after all you never really know how long a can has been sitting in the store).
I did hear good stories of the LRP lexan fluor paint, and my local store stocks 'Ghiant RC Car Colours.' I've only used their white, and based on that I may try others from the collection: the cans have a higher pressure and spray finer and more consistently than the Tamiya cans.
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