A good degreaser should work. Also, look into muriatic acid, that is supposed to be a good concrete cleaner.
You can not put oil paint over latex paint. Oil is a rigid coating and latex is a flexible coating. When you put a rigid coating over something that is flexible the rigid coating cracks off.
It depends on whether it is a water (latex) based paint or a oil based paint. If it is oil based paint it may not come out, but if it is a water (latex) based paint use 'Goof Off' or other latex paint removers with a wire brush. I have used 'Muriatic acid' on some concrete appications.
Oil based paint is not water soluble and so needs paint thinner to clean the brushes etc.
A good oil based primer, then an oil based concrete paint.
oil
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.
water based paint will usually wash off with water, oil based with turpentine or spirits, if it has dried a bit use some goof off
When The Paint Is Not Oil Based. example: Latex Paint!
Do you mean oil-based paint? If so, the answer is yes. All doors, window frames, kitchens and bath areas should always be painted with oil-based paint. Reason: They get dirtier than walls and oil-based paint is an easier clean-up.
clean oil from rubber
Yes, you can paint oil paint over sound water based paint easily, just be sure to degloss and clean the surface prior to painting.