I recently spray can painted a fender, which on the final coat with 1/2 of the can left, I ended up with some darker areas.  I shook the can for at leas :B :Bt 2-3 mins. before painting and during painting shook it often. Just wondering whether the darker areas are my spraying technique or was just the bottom of the can coming out darker?  I haven't sprayed the clear coat yet as I am not sure whether this darker areas will show through.  Do I need to sand this final coat down and get another can and apply a better final coat?  Color match was very good!

Sounds like you have a metallic paint and the trick here is to hold the can about a foot away on the final coat and move very rapidly to even out the metallic flake. Even professional paint shops have this problem sometimes.

:)  Thank you for the reply! That was pretty much the cause of the of the shading problem, in addition to my not putting on a heavy enough final coat.  I bought another can of spray paint and used it all for a final coat on the fender, held it back a bit more, and concentrated on putting on a heavier coat.  Must admit, color match was perfect and my spray can fender job came out damn near perfect as well.  With the fender on, cannot spot a difference from the rest of the factory paint.

Great. Have any before and after pictures?