Did mine last summer it wasn't pretty
Bad
Dremel that ****
And rust prime/treat, then mask off (allow correct drying time)
Then prime,
Then a few coats of paint (allow time between coats 15/20mins if it's warm)
Then a coat or two of lacquer (remember to blend into any visible area's)
Then take a snap of your car spoilerless before refitting, remember to seal any bolt holes that have dodgy looking rubber seals
