paint question??

couple things.....If you try to just re-clear, your gonna have to sand all the clear so it looks sweet(without touching any base coat color, very very tough)..otherwise all the defects that don't get removed will show thru your new clear...NOT GOOD.....

I wanted to do that very thing for my new paint job...no dice I was told..its gonna look like ass...I ended up doing a complete paint job myself...
Since its on the roof I guess you could try it though??? Most likely its gonna need a junior resto....sand with 320...wetsand with 500....mask off the roof...hi- build primer it...re sand again....shoot some base and then clear....buff..polish and your done...Not easy or cheap unless you do it yourself...

Theres not alot of clear on a paint job so feathering it out without wacking the base is gonna be tough....a slight recess from your old clear to the new will surely show thru and be noticable....I learned that when a damn bug landed in my first coat of clear... ..getting that little mother left the slighest impression in the 1st clear coat....the 2nd coat shows that little defect....see what i mean...that re-clear will flow into any little defect thats not removed....
Im no pro by any means....but I just went thru 2 months of prepping for paint....the littlest freakin defect, dimple, zit, ding, has got to be removed or you live with it....The guys who helped me were super fussy about that chit....they were absolutley correct....do it half ass, and you see it...depends on how fussy you wanna be???
My clear was spanked to, not chipped or flaking, just aged...good luck...

Everything RIO said was right on.... You could try doing it yourself and just wetsand with 2000 grit paper and make it all smooth, then spray some clear on yourself. If it doesnt look good then you can always take it to a professional and have them do it and you'll be out $xx.xx of money for the cost of clear and if it works you saved $xxx.xx amount of money by not taking it to a shop. If the clear looks OK after you sprayed it but has runs, you can always go back and wetsand the runs and buff the scratches out. I say try to do it yourself because it isnt all that hard.