Prime it first with an autobody primer spray.
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pva glue is not waterproof, however, some recommend mixing with nail hardener to make a homemade nail glue
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.
Porch and Patio Floor paint, specially for concrete floors. Less than $20 in Home Depot. -Make sure you prime it first, the paint goes a lot further .
Gloss. You can use any type of spray paint for spray paint art, but be sure it is gloss.
You have to use design center spray paint