Well, is your door around 25 years old?
The panels are probably made from ply wood and the sections or layers are seperating.
This will be a very hard job of sanding if you are bent on sanding off a layer of this wood. Matter of fact, its down right laborous.
You know, you can get a nice lightweight alum, pre painted, baked on finish for around $125 per single door? you might want to consider this or....
Work your tail off on the sanding and conditioning process of the old door.
Good LuckThis is solely my personal opinion on the situation, others may have different ideas, which I and we welcome. (disclaimer)
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