Use some filler to smooth over imperfections and sand with a rubber wet sanding block and soapy water. You can also use cellulose stopper for filling finer scratches that you can feel with your nails. You may need to re-apply filler if you don't put on enough. It's better to put too little & sand then re-apply - than pasting on too much as it it were porridge...
You might also want to buy some www.plastex.net
and use it to bond plastic over the holes you have in the fairing. Use masking tape tightly applied over the holes and apply plastex with FRP matting on the other side. Ready to work with after 30 mins.
You can use an orbital sander if you have one but not a problem if not. Start with say 320 grit and work your say down through 600, then 800. 1000 is really more for wet sanding before polishing - and will be too time consuming. Assuming you do a good job the surfaces should then be fine to then have panels plasti-dipped.
TBH I've never done plasti-dipping but I've done plenty of preparation for paintwork and seen it done for years when I was a kid hanging around my dad's car restoration shop.
For the difference in cost of plasti-dipping I'd probably opt for paint but if you do decide to go for paint, make sure the surfaces are super clean and free of silicones, etc. or you'll be having it done again.
Shouldn't be too expensive for a paint shop to spray your panels if you do the preparation well. They'd just spray filler primer, sand lightly to perfect any minor blemishes then spray a few coats and finally lacquer. I suspect you'll get a much better finish than a plastic coating which may later come unstuck since there's probably no chemical etching there? Like I say, I'm not familiar with plasti-coating so I can't say for sure.. HTH anyways.
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