BW and Dark Spots

Hey guys Ive been posting in here lately about getting my screen sprayed with BW...Well it's finally done!!! I'm very please with it but I have a couple concernes.....
1. there is a "texture" to the surface that was painted?? is this normal??? it's not huge like a topographical map or anything...but there is a "grain" like texture to it....like a real course sandpaper....

2. there are two distinct "dark spots" on the surface of the screen about the size of your hand... I asssume that either the BW layed down a bit thicker in these areas OR it layed down differently...My question is this....Can I go back with some fine girt sandpaper to try and take these areas down a bit and make it more uniform??? is this something that you guys have experience with?? is it advisable to go back over the entire surface area (not just the dark spots) to smooth out the texture that I was refering to in question 1???

Thanks in advance....and thanks to everyone for guidance in making this happen......Riff :bigsmile: