Seen a few Jaguar rear badge leaping cat chrome self adhesive's being sold. Just wondering would they hold up? car washes, cold, etc? and would they ruin the paint?

 

I don't think it would ruin the paint nor come off . Just make sure you use adhesive promoter if you apply it if outside temp is below 15 Celcius , pick up a sunny weather rather than rainy and make sure the surface that the badge will be put on must be clean and dry .