Most glues will stick to gloss paint.
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Clear primer.
Semi-gloss paint sometimes has problem sticking to walls that have a higher gloss paint type already on them. Usually, a light sanding and a coat of primer will help. Sometimes, semi-gloss paint peels if it was applied during high-humidity weather, as it doesn't dry all the way through.
Epoxy glues would be best.
No, often high gloss paint is oil based.
Gloss. You can use any type of spray paint for spray paint art, but be sure it is gloss.