We have a natural wood door that I built using paduk and cedar. It's
oiled and finished with an alkyd resin (Cabot's Clear Coat.) I expect
to refinish it every couple of years but that's not too much since we
really like the appearance.
To restore a painted door I'd urge you to look carefully at strippers
made by Dumond Chemical (New Jersey I believe.) These strippers should
be available at any good paint store. Peel Away 6 is probably what you
will want to use for a door.
Other strippers may cost less but when you're finished you'll discover
that Peel Away is the best from a cost/performance/ease of use perspective.
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