Ben-Learn from my mistake.  Recently, I went through the same procedure as 
you are doing.  I used a non-hardening caulk sealer that later caused 
problems with paint adhesion.  I had to remove the fenders&repaint the area.  
Contact the shop that will do the paint and let them recommend a sealer that 
is compatible with the paint they will be using.  That puts the monkey on 
their back if a problem develops.  I presume that you sandblasted the fender 
flanges&used some sort of rustproof paint (let your painter make the call).  
Berry
 
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