It depends on the state you live in. Check with your local paint store. If not, there are water-based alkyds and high adhesive latexes available that can go over oil based paints without a problem.
oil based
You can use either water or oil based paint, which are both available in a variety of sheens to paint molding. Water based satin coatings are very popular for crown molding in 2012 and have been for several years, while an oil based semi-gloss are the best choice for baseboards and door moldings where available.
Oil based primer is the best bridge between oil and latex paints. If oil based paints are not available in your area, a high adhesion acrylic primer over a well prepared surface will also work.
In the past oil paints referred to either petroleum based paints or linseed based paints. Today in the USA petroleum based paints are no longer sold and it is difficult to find linseed based paints though they do exist with a small proportion of linseed oil. Alkyd paints are made with synthetic oil and are readily available and have come to be known as "oil" paint.
it's been made illegal in some states. I don't think this will make it discontinued.
oil based
Yes. Clean and degloss the oil based paint, apply an oil based primer, then apply the water based paint.
No, latex paint is water-based, not oil-based.
You can use either water or oil based paint, which are both available in a variety of sheens to paint molding. Water based satin coatings are very popular for crown molding in 2012 and have been for several years, while an oil based semi-gloss are the best choice for baseboards and door moldings where available.
No, it is not recommended to paint acrylic over oil-based paint as the two types of paint do not adhere well to each other. It is best to use acrylic paint over acrylic paint or oil-based paint over oil-based paint for better results.
Oil based primer is the best bridge between oil and latex paints. If oil based paints are not available in your area, a high adhesion acrylic primer over a well prepared surface will also work.
In the past oil paints referred to either petroleum based paints or linseed based paints. Today in the USA petroleum based paints are no longer sold and it is difficult to find linseed based paints though they do exist with a small proportion of linseed oil. Alkyd paints are made with synthetic oil and are readily available and have come to be known as "oil" paint.
Acrylic paint is water-based, not oil-based or latex-based.
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.
Yes. Clean and degloss the oil based paint, apply an oil based primer, then apply the water based paint.
Yes, you can paint over oil-based paint with latex or acrylic paint after properly preparing the surface.