Now that the temp. has dropped below 70 again, I've been trying to strip
paint off the outside of a steel entry door again, but after half an
hour, except for the odd small patches where paint is coming off when I
scrape it, all that's coming off is a clear film (presumably the dried
stripper) leaving the paint underneath virtually unscathed.

The previous owners left none of this paint behind (they left others),
so I have no idea what it is. Supposing it is an epoxy? Would that
behave the way I'm seeing, and would that indicate that some
extra-strength stripper is needed?

Perce