Yes, you can paint oil paint over sound water based paint easily, just be sure to degloss and clean the surface prior to painting.
can i use water base paint over oil base paint
No, you can't .
Yes. Clean and degloss the oil based paint, apply an oil based primer, then apply the water based paint.
Yes. Clean and degloss the oil based paint, apply an oil based primer, then apply the water based paint.
Yes, you can
You can but it wont last, you will have a bigger peeling mess.
Yes, if the original is in good shape, not flaky.
yes
That is not generally recommended.
Water based paint such as latex and acrylic do not adhere well to oil paint. In order to paint over oil paint you must sand the surface and prime it with a good quality oil or alcohol based primer and then top coat with a water based paint. Oil based paints will adhere well to water based paints sp it is unnecessary to prime before top coating, unless you have had to do any repairs to the surface.
That usually works quite well.
Scrub it with warm water and a sponge sander block.