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The smoother the surface the better the cling. The cling is not adhesive based it is static based. The surface you apply the sticker to (and the sticker) must be both clean and dust free. Any foreign particulate matter between the sticker and the surface it is applied to will diminish the clnng factor. Like Joe (1985 CCX) said, once properly applied even rain will not wash them off.
Ed
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Help them do what they would have done if they had known what they could do.
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