I have always used something called tattoo goo. I do not know the composition of it but it seemed to prevent me from scanning.
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I actually have a car tattoo and joined the forum because I think it looks out of place all alone. I either want to add to it or cover it up. I would add a picture but can't do so for a week
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There are alot of gearheads that do tattoos. I would bring in all your examples and discuss it with the artist. This is permanent so your artist should be willing to take the time to go over all of the details before starting.