How to Make Your Nail Polish Matte
To make your nail polish matte, try using corn starch. First, apply a bottom coat of polish to your nails. Then, put a few drops of nail polish on a piece of foil or wax paper. Quickly mix in a small amount of corn starch before the polish dries so it thickens slightly. Next, use a clean brush to paint your nails with the mixed polish. Once the polish dries, you should have a matte, non-glossy finish! Alternatively, use steam to create a matte finish. To do this, paint your nails normally. Then, bring a pan of water to a boil. When the water starts bubbling, place your hand above the steam with all of your nails exposed, which will give you a matte finish. Make sure you only do this for 3 to 5 seconds so you don't burn yourself.
Apply a bottom coat of polish to your nails. Apply this coat as a very thin coat. Remember to buff and file your nails before applying any polish. Clean each nail with a cotton pad wetted with nail polish remover to clean the nail. Allow your bottom coat to dry. Get a piece of foil or wax paper. Put a few drops of nail polish on it. Obtain a toothpick and a box of cornstarch. Take a very small amount of cornstarch and mix it into the nail polish. Do this quickly, as the nail polish will dry out. The nail polish will be thicker than normal but this is ok. Make sure the polish isn't too thick or it won't spread on the nail properly. Use a clean nail brush to paint your nails with the mixed polish. Do this as you normally would. Remember to start at your cuticle. Paint your nails in three stripes: one in the center and one on each side. Leave a small gap around the nail for a professional finish. Allow the polish to dry completely. Once the polish is dry, you will end up with a matte, non-glossy finish. Remember not to blow on your nail polish or move your hands. Dry your polish with your hand flat and fingers spread. You shouldn't put a top coat on this polish, as it will give your nails a glossy look. Buy a matte nail polish. These are more expensive than regular nail polishes.  Brands like OPI, Essie, and Revlon make nail polishes with a matte finish. If you can't find these, Sally Hansen offers a matte topcoat that you can use over regular polish to achieve this look. Try shopping at a beauty store like Ulta or Sephora to find the most variety in colors and brands in matte nail polish. Use a nail buffer and file before you paint your nails. This will even out the surface and shape your nails for the best look.  Hold the nail file at a 45 degree angle as you shape the top edge of your nails. Mirror the shape of your cuticles for a natural curved shape to your nails. Buff the surface of your nails to get rid of any imperfects and to even out the surface. Any ridges or dents in your nail will show when you put matte polish on them. Swipe a cotton ball wetted with remover over your nail. Wipe this over your entire nail. Push this into the cuticle area and side walls of the nail. This will remove any dirt and debris that are on the nail. This also will remove natural oils from your nail that can serve as barrier for polish to stick. Let your nails dry. This should only take a couple of seconds. Paint your nails with a clear bottom coat. Many nail polishes have a bottom coat built in.  Check the label of your nail polish to see if this is the case. If not, apply a thin bottom coat to each nail. Do your dominant hand with your non-dominant hand, starting at the pinky and working towards the thumb. This allows you to paint your nails without risk of touching and smudging. Paint the color. Start by wiping off any excess polish on the brush off on the lip of the nail polish bottle. Place the brush close to the cuticle, then push back further without touching the skin. Paint each nail in three strokes: one in the middle, one on each side. Leave a small gap around the edges of your nail for a professional finish. Clean up your paint job. Dip a Q-tip into nail polish remover. Correct any mistakes, wiping the wetted Q-tip over any messy areas. Give your nails a last look to make sure you have cleaned up all mistakes. Let the polish dry for at least 2 minutes. Apply a topcoat. If you are using matte nail paint, you might not need a topcoat. If you are using regular nail polish, try a matte top coat such as Sally Hansen. Apply this in the same way you did the color. Let the topcoat dry completely. Don't blow on the nail polish or flap your hands. Allow the polish to dry with your hands flat and fingers spread out. Paint your nails with regular nail polish. Start by filing and buffing your nails then cleaning each nail. Apply a bottom coat and allow this to dry. Apply the color coat, taking care not to put the color on too thick. Correct any mistakes with a Q-tip wetted with nail polish remover. Let your nails dry completely. Pour some water into a pan. Put this on the stove over high heat.  Bring the pan to a full boil. Make sure the pan is creating a lot of steam. The steam will help to make the finish of your nail polish look matte. Place your hand above the steam. You will need to expose all parts of each nail to the steam.  Usually you need to just hold each hand over the steam for 3-5 seconds. Be careful not to hold your hand too close to the pot or you can get steam burns. Move your hand through the steam slowly to make sure all parts of your nails are hit by the steam. Check your polish. If should look matte. If there are parts which are still glossy, hold your hand over the steam for another 3-5 seconds. 
Apply a bottom coat of polish to your nails. Get a piece of foil or wax paper. Use a clean nail brush to paint your nails with the mixed polish. Allow the polish to dry completely. Buy a matte nail polish. Use a nail buffer and file before you paint your nails. Swipe a cotton ball wetted with remover over your nail. Paint your nails with a clear bottom coat. Paint the color. Clean up your paint job. Apply a topcoat. Paint your nails with regular nail polish. Pour some water into a pan. Place your hand above the steam. 