First, yes,you can use a flat clear like Dullcoat. I find one coat generally sufficient. Second, applying the gloss color very dry, with a couple of very thin coats should give at least a semi-matt. Third, sanding
Sand the Surface: Once the gloss paint is dry, lightly sand the surface with fine-grit sandpaper (eg, 220-grit) to dull the shine. Be careful not to sand too aggressively, as this can damage the paint. Apply a Matte Varnish: After the gloss paint has dried, you can apply a matte or satin varnish over the top.
You can sand it with some fine sand paper. Test first before you try some big project. Or you can get some matte varnish and coat it with that.
its very simple really, all you need to do is rub down the walls with a medium glass paper to remove the shine of the gloss, making sure you don't miss any areas. This will provide a good key for any paint you choose.
If you want to change the sheen, you can re-coat with a different sheen over top. The second layer of top coat will replace the appearance of the first. Sand lightly with a used 220 sanding PAD to knock down the original finish before re-coating. It may take two or 3 coats to get complete coverage.
To really get rid of that hard to remove paint, you can use a heat gun or blow torch to remove the paint. These specialist tools need to be used correctly and safely due to the heat. The heat on from the tools will heat the surface intensely, and lift the paint. Afterwards you can use a scraper to remove the leftovers.
Before refinishing try rubbing it out with rotonsone or pumice with oil or water. You'll get different sheens with different combos of those. Even 0000 steel wool with a gel like Elbow Grease can give a nice low luster hand rubbed look.
TSP is commonly used in cleaning products to dissolve and remove oily residues from surfaces such as walls, floors, and kitchen appliances. TSP can be effective for stripping glossy paint from surfaces.
Apply a matte finish on top of the glossy one using either a brush-on application or a spray varnish. If you're comfortable with your spraying skills and have a good can of varnish that sprays the contents evenly, apply the varnish in quick, even passes. Check to see that the varnish is not beading up.
Professional painters recommend you sand the satin paint off before applying a layer of eggshell. Since the glossy sheen of satin will make it difficult for eggshell paint to adhere to the surface. Even if the eggshell layers over easily, it won't last as long as you expect since it will start to chip or peel off.
Hand buffing
Buffing with a hand compound brings back gloss to the paint, and when done properly, is generally the least intrusive method of paint correction beyond a clay bar. Hand compound is used to treat small spots rather than large panels or a whole vehicle.
Clean Surface: Before sanding, ensure the surface is clean and free of dust or debris. Fine-grit Sandpaper: Use fine-grit sandpaper (220-320 grit) to avoid damaging the paint layer while still effectively removing glossiness.
For a beautiful matte finish that makes ordinary glass look like ceramic pottery, add 1 tablespoon baking soda to any color water-based paint and mix thoroughly. Use acrylic or latex paint only (oil-based paint will not work). Apply to a clean glass surface with horizontal brush strokes.
If you already painted your project and don't like the finish, do not fret; you can dull the finish down with a quick coating of spray-on or brush-on matte sealer. If you are painting something, and need a more muted shade of a certain color, you will need to apply a little bit of color theory to dull the paint down.
Use 91 percent rubbing alcohol, a degreaser/deglosser that evaporates and won't leave a residue behind.
Additionally, some eco-friendly or DIY alternatives like vinegar and water solutions or trisodium phosphate (TSP) can sometimes be used for light deglossing, although they may not be as effective as commercial products.
Unlike regular sandpaper, it just removes gloss; it can't be used to smooth the surface, correct imperfections or as a paint primer. Liquid sandpaper is also referred to as deglosser and wet sanding. The advantage of using liquid sandpaper instead of regular sandpaper is that it's easier to apply and safer to use.
As we've just said, some paints achieve matte finishes by using a special low-gloss clearcoat, known as a matte clearcoat. This type of clearcoat gives the surface a micro-rough finish, whichprevents the full passage of light, causing it to reflect in various directions and reducing the sheen and the reflected light.
EQUIPMENT/SUPPLIES Alcohol-based window cleaner (not vinegar or ammonia-based), matte paint cleanser, or a solution of 50% alcohol/ 50% deionized water. Tar remover or road debris solvent, if needed. Microfibre soft cloth suitable for matte paint.