already have the paint

ganhao

Can I Use Flat Paint For Baseboards And Trim?

oh'mike

You can--however, most people prefer the looks of a semi gloss paint for trims and doors.

Trims and doors take a lot of abuse---semi gloss doesn't show hand prints---and is easier to wipe clean if needed.----Mike---

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Brushjockey

You can do anything, but is it a good idea.
If you put that flat over an existing sheened paint, without a good scuff sanding it wouldn't adhere well. It would get dirty real fast because flats are very porous. It would not wash at all. And it looks wrong.
IMO, the answer is no. Just because you have it, doesn't make using the wrong product a good idea.
Use a satin to semi that is an enamel- made for the job. Many good ones to choose from. Most of them are not found at home depot...

Gymschu

Flat on woodwork.......I guess it's fine if you like an accumulation of dirt, marks from the vacuum cleaner hitting it, etc. and so on. Highly recommend against it.