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It's possible the plywood will start warped, and even if you pick a sheet off the rack that looks perfect, when you cut it it might decide to banana then as it had built in residual stress.
If its smaller doors would probably be aight but I'd be cautious / be prepared to accept not mm perfect alignment of edges on non hinge side if full height.
@dbr is the expert though so he might come and tell me I'm all wrong.
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Shouldn’t warp or cup, especially over a kitchen cupboard door size. BB grade ply
shouldn’t have any voids or things that need filling, but the end grain will show through paint unless you totally cover it with filler. The grain will show through on the face if you hand paint them. I like that, may not be what you’re after though.Cheaper option would be MR MDF, hand painted. No chance of warp and no grain. Water based hand painted finishes aren’t the most durable though.
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Check out the online kitchen people DIY kitchens et al. Then see who supply the doors then find a local supplier to see the doors in person?
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I don’t reckon 18mm birch would warp.
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@Spxtz
Kitchen cupboard doors: I can't find ones I like at a good price. If I get 18mm ply cut to size and fill/sand the end grain then paint and varnish the whole thing, will I prevent it warping?