thanks for the replies! this is what i decided to do. im gona fill the scratch carefully with touch up paint just so its a bit higher than the normal paint level. then sand it down with 3m imperial wet/dry 2000 grit ( i could only find 1000 and 2000, no 1500). sand it with tiny pressure with some soapy water. stoping frequently to dry and check very often. once i see similar results as that picture where the paint has evenly sanded out a bit, ill use the 3M rubbing compound with a terry pad. lightly rubbing in teh same direction with about 20 strokes max and checking results. then i will use my 3M SMR on another terry pad and in the same direction also with med pressure to light pressure as it dries up.
now i need another clarification, how much of the rubbing compound should i use? when do i know its enough and i should use the SMR polish? after the rubbing compound, do i just keep using the SMR as much as i want till i acheive max results? thanks again!