When I replaced the wooden front door of my house I replaced it with
a fiberglass door.. Cost a bit more, but I should never have to
replace it again in my lifetime.
I worked for 2 different window and door companies over the years and
saw enough trouble with exterior wood panel doors to convince me never
to buy anoyher one.
1. Hand sand the areas with a hard rubber sanding block. The goal is
twofold: 1, accomplish some but not all feathering and 2, primarily, to
renew the weathered surface of the exposed wood.
2. Get a tube of fairing/body purtty at Napa or other similar. You could
use Bondo but the putty is easier to work with and MUCH easier to sand. It
is basically talc and lacquer so if you have the ingredients you can make
3. Apply the putty with one of those credit card size, flexible plastic
spatulas used for bondo. The goal is to fill low areas. When dry, hand sand
the areas with a hard rubber sanding block. Repeat if necessar.
4. Prime and paint.
BTW, the paint will probably eventually crack again at the joints
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