Yes, but you will want to lightly sand it first, then use a barrier/adhesion coat of primer such as Kilz, or a good alkyd primer.
If it has a matte finish it should be easy to paint over.
Yes, you can.
Yes. You can paint semi-gloss latex paint over flat latex paint. It is not advised to paint over any latex with any oil-based paint. Nor is it advised to try and paint over semi-gloss paint with any other finish without first de-glossing the finish and priming.
You cannot paint over slightly tacky latex paint with a water based polycyclic finish. You should always wait until the latex paint is thoroughly dry before painting over it.
What they call "oil base paint" is really called "alkyd base paint." So yes, you can do that.
Sure but hit it with 400 grit as the paint needs something to stick to
Yes, you can apply varnish over paint to achieve a glossy finish. Varnish is a clear protective coating that can enhance the appearance and durability of painted surfaces.
If it has a matte finish it should be easy to paint over.
Yes, you can use polyurethane over paint as a protective finish.
Yes, you can apply lacquer over paint to achieve a glossy finish.
Yes, shellac can be used over paint as a durable finish.
Yes, you can apply lacquer over paint to achieve a glossy finish.
Yes, you can apply polyurethane over paint to provide a protective finish.
Yes, you can apply polyurethane over paint to create a durable finish.
Yes, you can use lacquer over paint to achieve a glossy finish.
Yes, polyurethane can be applied over paint to provide a protective finish.
Yes, you can use polyurethane over chalk paint as a protective finish.