GSF sells panel wipe, I'm sure there will be one not too far away.
I know it's more work but I would suggest a rub down all over with 320 grit to get rid of the etch primer and then a coat pf ReFace applied with a fine sponge gloss roller as Jeff did.
This will hide an awful lot of imperfection but more importantly it will seal the filler and GRP repairs together and prevent sinkage which could be a problem for you later on as you have used a tad more filler & GRP the most!
If you put your top coat on with a gloss roller you don't get any brush marks and it flows out very well. I have always used a foam brush for where you can't get a small roller in.
http://www.ebay.co.uk/itm/Rustins-Fo...QAAOSwajVUO5Nk
Chin up, you are slowly winning.