What is wrong with my paint on my car help 10points?

Jin

New member
Im going to take my car at a body shop and paint it. But first I have to get it ready and preped up. The car is black (1995) and has strange thousands of small lines about 1/2 an inch all over my car full of it?

Why is that?
What kind of sand paper grip should I use to get rid of them?
Should I watersand the car before paint?

Will give 10points for best answer thanks in advance
 
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