Yes, but you should clean and lightly sand the gloss paint first, to give the new paint a good 'key' surface.
Cleaning can be done with a degreasing agent such as 'sugar soap', following the instructions thoroughly before applying the new paint.
Yes.
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.
Yes, but you should scuff the gloss coat with sandpaper first, and you might need two coats to kill all the shine.
Can I paint semi gloss over flat paint? Thanks!Barbara Phillips
depending on the surface finish of the primer. Noirmally its matt in its appearance and will take a water based gloss. However, a primer should have an undercoat applied first unless its a primer/undercoat.
High gloss Exterior Oil-Based Gloss Enamel over Quality Primer will give the best results on a cornice.
Yes, you can. You can always paint over with same paint.
yes.
yes
Yes. We use oil primer on all our out door projects. Not sure why you would want to though. If I was going to put another coat on, why would it be clear? You should just put another coat of whatever color is up there now.
depending on the surface finish of the primer. Noirmally its matt in its appearance and will take a water based gloss. However, a primer should have an undercoat applied first unless its a primer/undercoat.
the high gloss acrylic would bead up and not give you an even application over the oil based