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Hi I also hate MDF at the best of times but where it shines is exactly as you've described and perhaps a desk top, if your using 20mm you should be more than fine, there are better woods out there for book shelving but if you are painting it, then bit of a waste using a good wood, perhaps before you paint try some other finishes you may be pleasantly surprised, personally I wouldn't paint it because you will lose the smooth finish MDF already has, I know I would much rather re oil/wax this than repaint in the future. good luck
Hi Forumengers.
This isn't strictly DIY as someone else is doing it but: We are looking at getting a full wall library-esque shelving system made similar to the image below. The chap who is coming to take a look has recommended MDF (around 20mm).
Personally I hate the shit and I am worried about flex , but he reckons that unless we get spendy on a hardwood, MDF is our best bet as cheaper wood such as pine are poor quality these days and we'll be painting it anyway.
What doth you think to this? Sound legit.