That usually works quite well.
can i use water base paint over oil base paint
Yes. Clean and degloss the oil based paint, apply an oil based primer, then apply the water based paint.
Yes, you can,
No, you can't .
Only if the 'flat paint' is water based too.
Any paint that has the word 'acrylic' in the title is usually water based.
Water based paint is often termed "latex based" and it is used for a vast amount of applications.
Yes, you can, this is an excellent base for sticking to.
no it will peel. must use water base with water base & oil base with oil base.and use an undercoat to hide stains.
Water base paint catch fire and make you very bad hurt
Solvent based.
Not a good idea, better to use oil based primer.