Hello there !!! Iv come across this before , what it is, your bonnet has most prob been sprayed before with what I would say is cheap laquer !!! Basically the laquer has no build on it , and scratches and cracks after time ! Worse case was a guy brought a car up to me ( I'm a paint sPrayer) after he took it through a car wash ! It's all cracked and blisterd ! I asked him have he had this part of the car painted before, and he said yes a guy done it ( out of a bloody van) smart repair ! Soni said its cheap paint he has put on it then . I got the car in , sanded down the paintwork , give it a good two coats of 2k primer, let it dry for a few hours ( this helps seal the crap paint underneath) then flayed down, and sprayed with proper paint !!!! I'm going from your pics, but what I know is you most prob can't even feel the scratches
Basicly coz it's all cracked underneath ! I'm viewing these from an I phone !! Hope this helps, or is at least some info for you !! Deano lfc