Variable adhesive quality

I have mix feelings about this product. I have purchased different stickers in the last year. Some have worked excellent but some have been terrible. The clown fish, the dolphin and whale stickers have lasted long on my son's bathtub. However, the shark started coming off two weeks after I installed them. Two of the five turtles I installed came off just two days after I installed them. Seems like quality control on the adhesive part is no good at all.

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