Can echo the flashing strip for along the ridge. I moved my shed a few years ago and it was easier to cut through the felt on the ridge and then repair with this once it was re-assembled than re-roof it all.
I worked in a Butchers in an earlier life and was always told the same. Constantly had to use the steel to keep a fine edge on knife. Always applied the same logic to handtools.
I've recently bought 2 dipped and stripped doors fitted to replace the existing doors in the living room.
I know some will not be happy with this and will say that I'd have been better to keep the paint on... however the 5 doors upstairs had been done by previous owner and it was cheaper to...