DA sand marks

Getting ready to paint my car, I stripped all old paint off the front and rear bumper but I left a bunch of marks in the plastic from the DA sander. Would it be best to fix this with a high build primer surfacer or with a glazing putty like this:http://www.eastwoodco.com/shopping/product/detailmain.jsp?itemID=1650&itemType=PRODUCT&iMainCat=516&iSubCat=518&iProductID=1650

Also for plastic(SMC) and fiberglass body panels should I spray an epoxy primer first and then primer surfacer. So it would look like this, epoxy primer, primer surfacer, base, clear.

A few "unanswered" questions here, so this response is fairly general!
The main question - - What grit sandpaper did you use on your DA? If it was 180 or finer, a filler putty will not be necessary.
Did you sand all the way to the plastic? If so, you first need to apply an "adhesion promoter" (a fancy word for "plastic primer") on all exposed or bare plastic.
An epoxy primer will work, but an unnecessary expense. A good grade high-build primer-surfacer will suit your needs just fine. The brand is entirely up to you, but don't mix brands! (a common mistake made by many painters)
My guess is, this doesn't satisfactorily answer your question, but I will need a few more details to do so.
If you would like, email me and hopefully, I can be of better assistance!
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