You could use a plastic dip coat as well.
Ive used plastic dips when i used to bench on DICE.
Sadly, real work got crazy and i have stopped benching since.
meh... SR-2 might just bring me back.. drool.... maybe i can finally try out LN2...
Q56 I wouldnt worry too much about it.
Clear the debris and leave everything as is.
for the hk 3.0 you want to just lightly sand the debris off if its stuck there.
DO NOT sand the whole block as some have mentioned, the HK 3.0 is bowed for a reason.