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Spray can be a noun or a verb.
If you mean on top of a spray paiting, just use clear glossy spray paint. Thats what i use as a seal and it works great.
The spray headliner caprice uses a solid backing board which can be replaced. It is usually held together by the spray-on headliner adhesive
If you are looking for a slick look (circa 1980s Wham! or Saturday Night Fever) I recommend hair gel.
Otherwise, I would recommend hair spray.
spray guns atomize liquid true or false