damn, my car got messed up with a long line on one of my rear door. I tried to make it less noticeable and sprayed black paint since my car is black. Now it looks dull and the rest of my car is shiny and I can see my reflection. Any suggestion on how I can fix this or make it shine and still blend in with my coating?

 

I think you'd need to add clear coat for that area to shine.

Try a professional body shop...probably should have went there first...

 

You will need to take it to a body shop like she said.... Base coat clear coat paint that is used on cars today are hard to match... The stuff is expensive too.

 

Try polishing it, you may be able to blend it in somewhat. Although im not sure how big of an area you sprayed. Although, I recommend taking it to a professional.