With many of the new acrylics,they claim that you can. -I think I'd still rather prime it first.
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.
Do you realize that you can get FLAT ACRYLIC PAINT. Flat paint refers to the gloss level. You may want Gloss, Satin, Lowsheen or Flat. Acrylic paint on the other hand refers to what the paint is based on or what binder is being used. Acrylic paint is also refered to as waterbased paint. You most likely are referring to putting flat acrylic over lowsheen or gloss acrylic. In answer to your question - as long as they are both acrylic than you will not have any problems. I am in this answer assuming that you are referring you house paints. If not than the same principle applies - acrylic over acrylic is fine. To keep acrylic from going glossy just don't polish it.
In interior or exterior house paints.... Acrylics, emulsions and latex are, oils, lacquers and shellacs are not. In artists' paints... acrylic, watercolour, gouache, and some water based airbrush paints are, oils are not..
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.
Using incompatible paints can result in devastating results. Do an online search for Ramuc swimming pool paints. They have great information regarding what paints are compatible with others. I believe the web site is ramuc.com
Yes, you can paint over oil-based paint with acrylic paint, but it is important to properly prepare the surface by sanding and priming it first to ensure adhesion.
Yes, you can paint over oil-based paint with latex or acrylic paint after properly preparing the surface.
You can use oil-based paint pens over acrylic IF the acrylic has not been applied too thickly. You can also use water-based paint pens. HOWEVER, you cannot use acrylic over oil. The difference in how these two mediums dry and cure can make the acrylic-over-oil crack.
Water based paint such as latex and acrylic do not adhere well to oil paint. In order to paint over oil paint you must sand the surface and prime it with a good quality oil or alcohol based primer and then top coat with a water based paint. Oil based paints will adhere well to water based paints sp it is unnecessary to prime before top coating, unless you have had to do any repairs to the surface.
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.
Acrylic paint dries quickly and is water-based, while oil paint dries slowly and is oil-based. When you paint acrylic over oil, the different drying times and bases can cause the layers to crack or peel off.
No, there are some paints, like many water-based paints, that will not block air and moisture and can not be used on metal . Most solvent based paints, like an alkyd or lacquer, over a proper primer, direct to metal water-based acrylics and multi-part epoxies and urethanes can be used over metal successfully.