IDK about spraying plastidip through a gun.....but it could easily be done to cover the roof. Shoot, there are many people with their entire hoods covered.
Just make sure to mask of some areas good to avoid overspray, and lay it on THICK. The thicker it is, the better it stands up to UV and the longer it will last. Plus it will be easier to take off when you have to redo it.
My STILLEN chin spoiler is holding up fine in PD.
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