Hi there,
Technically you can, but there may come a day where things starts to chip off. If you have the time, maybe it's better to take off the latex now. On the other hand, if the latex-over-oil was primed well (with shellac), it will hold, and painting oil over that will be OK too for at least 5 years.
The oil will suck into the latex, and become matte and maybe blotchy. You can help it by either priming it first (shellac or oil-based primer), or shining it up with a laquer afterwards.
No, you either need to really rough up the oil paint with fine sand paper, or put a base coat on before you paint with your Latex paint. If you don't your Latex paint won't adhere.
Yes, oil based paint is very versatile and can be painted over many painted surfaces, including those previously coated with latex paint, as long as the surface is dull and clean.
Yes it can.
There are some water based coatings that will adhere to an oil based surface without using a primer; however, an oil or acrylic-based primer, used as a bridge, will allow you to paint latex over an oil-base paint trouble free.
yes but not the other way around the latex passes moisture
No, it is not recommended to paint latex over oil-based paint without proper preparation, as the latex paint may not adhere well to the oil-based surface.
No, it is not recommended to paint latex over oil-based paint without proper preparation, as the latex paint may not adhere well to the oil-based surface.
You need to prime first, with a primer that adheres to oil paints, and to which latex can adhere. You may even want to sand the oil-painted surface lightly to scuff it for better primer adhesion. Painting latex straight on top of oil paint will result in peeling.
If you have painted latex over oil based it will peel of very quickly.
No, latex paint cannot be applied directly over oil paint without proper preparation.
Any paint and decorating store should have little pads (like wet-wipes) that you rub onto the painted surface. Whether or not the paint rubs off will tell you what kind of paint was originally used.
Either oil or latex primer can be used over interior latex paint.