This is probably the last week of good weather before it gets to
freezing during daytime. Miracles of miracles I found the motivation
to repaint my insulated steel skinned front doors. A patch of the old
paint had flaked off and I sanded it to feather the edges. After
painting the flaked off paint edge still showed. Sanded that and
repaint. The result was worse, now I have a bigger visible patch.
The question then is will filling the patch with bondo then sanding to
feather the edges work?
You might try painting the "patch" area with an automotive sanding primer,
then feathering that until you can no longer feel the ridge where the paint
ends and the primer begins. Repaint the whole thing and you'll probably be
happy. It may take a couple of coats...
The first time round the edges were visible but only on close up. I
had used a rough sandpaper (I used whatever I had at hand from my
model making hobby) to sand back any "flakable" paint edges which
fortunately wasn't much. I finished off with a very fine wet paper
that clogged easily which is perhaps probably why I didn't feather the
edges to satisfaction. The second time round was with a pneumatic
hand drill attachment and sanding flapper wheel. The sanding flaps
were coarse grit which I think made worse the problem. They are
visible gouges after repainting. I have way too many tools and don't
use them often enough to remember their performance characteristics
without making errors on the first round. Drat.
I'll wait another day for the paint to harden throughly before trying
your implied recommendation to use a series of sandpaper grades to do
a proper job. I'll also use Kyle's recommendation to use automotive
primer - the brown spray bomb stuff. The door paint is the Tremclad
dark brown metal paint applied by a spray gun. The temperatures (deg
C) for the week are in the high teens during daytime and in the low
single digits by early morning.
One more question. The flaked off paint area was down to bare metal
and the painted layers are about paper thick. I agree its too thin
for bondo to hold. Is there any other way to "fill in" the
depression? Its about the size of a legal sized envelope.
<< The question then is will filling the patch with bondo then sanding to
feather the edges work? >>
Maybe, but why bother?
Consider all the ways a metal house door resembles an automobile door.Then
think about the superior finish any autobody shop could put on the door. Then
factor in the reasonable prices at most shops and it seems like a no-brainer to
remove the door and take it to a place that can make it better than new. HTH
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