For car window paint ideas you’re going to want first to choose a paint that’s easy to remove from the car windows—acrylic and other water-based paints are popular choices.
Here are some car window paint ideas to help you get ready for that surprise:
A couple more things to consider: since your sister still has to drive your car, make sure whatever designs you pick still give her the visibility she needs while she’s on the road! Later, when it’s time to remove the paint, you should be able to do so with a scraping tool, warm water, and soap or a window cleaner.