To use normal paint in bathroom?

[passthegin1234]

I have some leftover paint which I wanted to use in the bathroom but it's not bathroom paint. Is this a bad idea?

Normal emulsion?
Yes you can absolutley use it on the walls. I only ever use standard emulsion or wallpaper on non tiled bathroom walls.

I've used normal wall paint in the bathroom and it's been completely fine!

How good is the ventilation? If it isnt a damp room you should be ok.

Depends whether it's likely to get splashed from the sink/bath/shower. If so, then you do need to use bathroom paint. But if it's nowhere near a tap/shower, it'll be fine.

If it's a larger/or well-ventilated room I would.
If it's prone to damp, I wouldn't.

Depends what type of emulsion it is.

I am knocking 50 with almost a lifetime of DIY and have made some serious bad judgement calls on this one over the years.

In bathrooms and kitchens it's all about mould and Mildew.

Vinyl Silk is usually totally fine. Little difference between it and kitchens and bathrooms paint. I always use it in moister locations.

Eggshell can be OK depending on quality of finish, some are more absorbent than others.

Matt paint can be hard to keep the mildew off. The black speckled look isn't great and is hard to get rid of once it sets in without completely removing the paint and starting from scratch. It's not the visible fungus that's the problem, it's the filaments that penetrate the more open structure of matt paint. You wipe off the black bits and it grows back in no time because you can't get at the filaments inside the paint layer. Also takes longer to dry out if it gets damp. Moisture attracts things like mites and silverfish.

It's up you in the end though. It's your bathroom and if you're willing to fix whatever goes wrong that's your choice really. Beware a fix up job takes more time, effort and money than just buying a tub of fresh paint in the first place. Using up left over paint is one of the DIYer's worst false economies most of the time.