Those that use it generally use it only in the striker channel when they don't want to disassemble the slide. Shouldn't need to cover the sights.
I'd not use it anywhere else, only places difficult to get to. Most cans lose their propulsion before I ever use them. Pretty rare.
I have a can of Gun Scrubber that's probably 10 years old and I don't think I've ever took the top off it, guess I should see if its still any good.
In Memory of Paul "Dietrich" Stines.
Dad: Say something nice to your cousin Shirley
Dietrich: For a fat girl you sure don't sweat much.
Cue sound of Head slap.
RIP Muggsy & TMan
"If you are a warrior legally authorized to carry a weapon and you step outside without that weapon, then you become a sheep, pretending that JOCKO will not come today."