Possibly because the tile adhesive wasn't totally cured, or the oil base paint wasn't sufficiently mixed. I have used oil over tile adhesive and it worked for me.
You really shouldn't. most wallpaper adhesive is water soluable and will cause the paint to have adhesion problems.
Yes, you can.
Yes, you can. You can always paint over with same paint.
Yes, you can
can i use water base paint over oil base paint
What they call "oil base paint" is really called "alkyd base paint." So yes, you can do that.
Yes, you can, the base is similar.
If the base coat used in your project is water base then yes, you bet you can. If there is any chance that the base coat used was an oil base paint then you cannot paint directly over it. The acrylic enamel will not adhere to the oil base paint and will begin to peel off as soon as it is dry. In which case a coat of primer is in order.
no it will not stick
No, you can't .
As long as they are the same base you can do that.
no