Water based over oil based paint?

Doesn't work like this

Yes you can, but you'll need to sand first!

Hi, Handy hands here.
Always prime when using water-based over oil-based paint.
Apply one to two coats of a water-based bonding primer and dry according to product directions. You'll know the surface is adequately primed when the former paint color, stains, and other surface imperfections are no longer visible.

Hope this helps

Yes but you would have to put more than one coat over the oil base

Yes if you sand and use uncoated

So long as you put a 'key' in the oil paint by lightly sanding all areas you will not have an issue.

That's fine , however you will need to de-nib the existing paint , sand the paintwork down soap to let the new paint key to the existing

Yes it is ok, you have to follow few steps though. First sand the oil based paint with a 180 grind sand paper then wipe, with a dump cloth, all dust then apply one or two coats of primer( best one is Zinsser 123 plus, bit pricy but worth every single penny) and then paint, two or even three coats.

Is better after good sending to put one coat undercoat water base ..

It will most likely peel because the paints will not bind well together

Yes that’s totally fine give it a good rubdown 1st so it can stick to it and leave a good finish

Yes but make sure it gets a good sanding first to provide a key for the next paint.

You have to rub down All over with sandpaper before You painted

If you use water based over oil it will lead to cracking and flaking as it do not go together

Please try pva first to give a base to stick to