What you will need to do first is run some strips of strong masking tape over the main part of the fairings (the bit thats on show) and fibreglass from the back. The masking tape should give the fibreglass a good smooth finish so there will not be a lot of filler needed, maybe just too smooth it over a bit.
Wet and dry is not good, you want a good not to harsh bit of sand paper to begin with ans sand so the filler is nice and smooth.
Warm the primer up at this time of the year or it will be too thin and lightly dust the areas holding the can a good 12 or inchs away from the parts that need spraying. Yuo can not use the wet and dry to flat the areas off between coats.
Take your time and be cool and you should not make any mistakes.
