Almost every air nailer will countersink the nail to some extent and you
want it to do that. In doing so, there will be the so called 'ding'
mark left. If it's on unfinished wood you can use wood filler found in
the paint dept. It's sandable and fills the ding very well. If it's
painted/tinted they make fillers that are colored--still in the paint
department. I would never go back to using the hammer just to get a
nail flush but I do keep a good supply of the nail filler compound.
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