I've never done an overnight with Sweets, always read that was a no-no, that it may etch the bore.
So, I would be cautious on that advice.
Dyna Bore Coating is a great option, but you gotta get the barrel really clean down to the bare steel.
I DBC my new barrels, even premium ones that may not need it. Can't hurt, may help.
Properly treated, the good ones just about don't foul, the lesser ones foul a lot less.
DF
