A friend of mine had a Humber Pig painted purple to use in a film. They assured him that it would "wash off easily" but five years later, with it living outside in UK rain it was still purple, but now with green mould added. I suggest that you paint something with the paint that your vehicle is painted with and do demo patches of whatever is suggested onto that. If you do get offered film work, make sure that your time is paid for as there will be much more messing about and waiting than they will admit to.
David
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