If it's the fenders, then it's REALLY advisable to have them painted at a body shop. Automotive painting can be tricky and expensive if you make mistakes. It's an art form and requires a lot of knowledge about proper prep, chemical mixtures, environmental issues, application, equipment and the list goes on and on. It's REALLY worth saving up for the services of a professional.
If it's just the flares, try a heat gun before painting. It works miracles and there are a number of threads on this forum that address that particular topic.
06 Rubi with some sort of double ended, chrome knobbed, cross threaded, infinitely adjustable, frequently breakable, worn out flammywhammers zip tied onto it.
It used to be a jeep thing... til that sh!t broke!