Repaints are one of the reasons that I haven't tried coatings. On the last repair that I had done on my truck, the repair was made to one corner of the hood. The repair recieved a basecoat blended into the exsiting paint and then the whole hood received clearcoat. Using this process, I wonder how much actual scuffing is done to the whole hood and will the scuffing for sure remove the coating. Typically when I know that I am going to have paint work done, I remove all the wax/sealant with a solvent prior to taking my vehicle to the shop. I would hope that the shop scuffs the whole panel before they begin the repair.