Steel is great, but I find that highly usual, as most rolled sheet roofs are aluminum
Eternabond is great stuff
When I cleaned the roof edges and cap seams
I bought one of those vibrating multi tools
I then cut and used one of those Teflon type plastic spreaders used for Bondo fiberglass work as the blade, instead of the standard metal one
This way I could cut and scrape off all the old sealant and puddy without damaging the roof
And it a lot faster and easier than using a hand scraper
Btw I've used the tool and its various saw and scraper blades many times on other projects well worth the price, and my harbor freight version seems to work as well as the more expensive versions