I know Mike knows what he's talking about where spraying is concerned, but I contacted my paint manufacturer (Jawel) for advice before painting mine. They said I needed to degrease and key the surface first, then apply a couple of coats of etch primer before using the high build and top coats. They said their high build wouldn't stick to the 'glass without the etch primer first.
I sprayed it about ten months ago and it's still fine.
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