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Hi there I have been a car painter for 30 years an unfortunately there is no substitute for hard work, you should steer well clear of the DA sander as they are designed for flat surfaces and that rules out your cobra. You will just create lots of lows in the surface as it runs so fast , you need to take your time .Use a selection of rubbing down blocks and start with 180 grit when rubbing down the epoxy spray filler (do not use water when rubbing this down you must use dry sanding paper) then 240 grit to finish. When finished spray your primer filler on (3 or 4 coats)and rub that with 320 .Apply further coats of primer filler and block that down with 800 grit. Always use a guide coat on the surface before starting to rub down, the best stuff to use is 3M Guide coat powder, its easy to use and can be easily applied .You are now ready for base coat and clearcoat.
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