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Are you talking for the hood, so that you have a nice smooth finish to paint?
Some people drill a hole at the end of the cracks to stop them from spreading before repairing. Depends on how big they are.
You'll need to sand down through any wax and scratch topcoat so that your material will grab.
I've always used the liquid fibreglass mesh repair kits from BONDO on my cars and trucks. Used it on my wifes sled this year and it worked well and didn't re-crack. Comes with everything you need for small repairs. I would always repair/re-inforce the cracks with the fibreglass mesh from the underside, then sand out the area on the top, and fill with either spot putty if its REAL small, or the fibreglass and hardener filler without the mesh if its bigger. There are do it yourself sites all over and most are similar (just did a quick search).
I don't really have a favourite site as i have a haynes manual at home that describes things pretty well.
Just take your time during the prep work, although by your painting so far it doesn't look like i need to say that at all.
One more thing, its much easier to layer to fibreglass filler on. You can use a file to shape it and scrape it, but once it hardens its a major pain to sand.
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