Sticker Printing Services — Decals & Bumper Stickers Decal and Bumper Sticker Printing Services at Wonka Promotions. Createa lasting impression with top-quality Wonka Promotions Decals and Bumper Stickers. Printed on a four-color sheet-fed printing press with fade-resistant inks, Wonka Promotions Decals and Bumper Stickers maintain their brilliant colors for at least six months under normal use. And like all Wonka Promotions products you can count on cheap prices and fast turnaround. In fact, Decals and Bumper Stickers can be printed in as little as three days. Custom Die-Cut Stickers and Decalscturn your printed stickers into works of art people will want to keep.