Not sure when it was last painted, but at least 10 years. The rails and stiles are wood, and I thought the panes were, but one part where it's chipped looks like MDF. In some places the paint is peeling, so I started in those spots with a wire brush and sanding block. The panes are in much better shape than the rail and stiles.
How much should I remove? It seems like if I keep working at the edges of the peeling stuff, it will just keep peeling. Does that make sense? Like after the obvious peeling stops, I can scrap more and more paint will come off. Not sure if it was loose or I'm scraping off good paint.
Not sure when to stop. Is it better to just peel as much as possible? That will make a long day(s), but might make it last longer?
If it was mine I'd be replacing the whole thing with a new metal door so you never have to deal with this again.
A random orbital sander with 60 grit paper will get it down to bare wood really fast, if it comes out to rough just make a quick pass over it with 100 grit, I'd be wearing a mask because it may be lead based paint.
If any of those MDF panels are rotten they can be removed from the back side and replaced with 1/4 under layment rated plywood.
I'd prime all the bare wood with oil based primer, then use latex over it.
Yeah, ditch the wire brush. It takes longer and scratches the wood. A putty knife with a sharp edge and a carbide bladed scraper can make fast work of scraping a garage door like that. An hour (tops) is about all it should take unless you're really being meticulous.
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