applying filler

When doing the fiber filler work it does not have to be straight... just get it close, it's just for major filling. Also, the area's that I have circled look to be low and darker in color. I am guessing that they are darker because they have not been sanded. No problem, just take a bit of sandpaper on your finger and scuff them up good before adding more filler. You need the sand scratch for mechanical adhesion of the next coat of filler. Just make sure that the fiber filler is low enough that it doesn't peek through when you start sanding the final filler.