Previously painted furniture and walls have a slippery surface. Someday, you may want to decide to paint over the paint layer. Slippery surfaces are difficult to paint. Often, the paint does not adhere to the painted surface and will still be prone to "peel" easily. By following some basic surface preparation steps, it will still be possible to spread paint over a layer of paint.
Step 1. Clean the entire area you intend to paint with a good household cleaning product
You can use an abrasive sponge while cleaning the area. Try to remove as much residue as possible. You will need the surface to be free of dust and any type of buildup.
Step 2. Make sure the room where you will be painting is well ventilated
Make sure you have properly protected the floor and surrounding area so you don't damage anything while cleaning or painting. You can cover the floor with painter's cloths.
Step 3. Remove all metal parts from the furniture you are working on
Step 4. Thoroughly sand the area or piece of furniture with fine grit sandpaper
This will give the surface the necessary texture for the first coat of paint to adhere. Try to sand in the same direction as the grain. Completely remove any residue left by the sandpaper.
Step 5. Fill any scratches or chips in the wood with suitable putty
Rub sandpaper over the grout once it is dry.
Step 6. Scrub the area or furniture you intend to paint with paint thinner or denatured alcohol
You will need the surface to be clean and matte, and that is exactly what these products will do.
Step 7. Apply a first coat of paint
If the paint layer is very dark and particularly difficult to cover, you may need to apply 2 coats of paint. It will be better to use an oil mastic to paint over the paint. The oil mastic will create a surface suitable for the adhesion of the paint.
Step 8. Paint your chosen area or furniture with oil or silicone paint in the color of your choice
Apply as many layers as needed to completely cover the paint.