If you question it and want to be sure, take 400 grit wet/dry sandpaper and make a quick pass on the back side. Thatís all it takes if it takes anything.
This also works for holes that you canít get a debur tool on. Might need more than one pass depending.
I have seen quite a few aircraft that had very poor edge finishing and I suspect those builders also had very poor hole deburring, but have yet to see a crack even in the poorest quality build. So, yes, debur, but donít make yourself crazy.
Smart People do Stupid things all the time. I know, I've seen me do'em.
RV6 - Builder/Flying
Fiat G.46 -(restoration in progress, if I have enough life left in me)
RV1 - Proud Pilot.