Vince and Barry are the go-to guys on this sort of stuff. The only thing I would add is that if you go to the major paint supplier sites on the web you will find an assortment of tacks and each has its recommended tasks. I ended up buying two different grades, one is basically for fillers & primers and the another for paints and clears. Don't ask me the difference...plus I'm not sure it matters. For the cost (I bought them by the dozen and they were still pretty darn inexpensive) you can't really go wrong in using what the paint supplier recommends.
Always learning...and sharing what I've learned.
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