If there’s one thing I hate above anything else it’s decorating 
I wish I could just push a button and it’s done.
On a side note I’ve had to pause painting as the fumes got me high to the point I collapsed and had to crawl upstairs to lie down 🤦 and that was with the windows open.
I’ve now bought a respirator off Amazon that was recommended off various searches for masks to decorate in.
Get one of those paint guns. They’re surprisingly cheap and seem to make painting so much easier.
I briefly looked at reviews on Amazon and there was lots of praise. Although I personally don’t see anything wrong with a roller, it’s cheap, quick and easy enough.
You can also get VOC paint that doesn’t give off fumes. I think that’s what it’s called 
I’m using trade paint from crown shop across the road. It must be made differently to commercial home use stuff, I’ve never felt ill from paint before and that’s the only thing I can narrow it down to.
A paint gun 
that just sounds like I’d decide to shoot it everywhere 
They could well be rubbish and I guess there are different types too. I’ve never used one but I read reviews on a particular model that was around £35 - some reviews even had videos and it looked pretty good. Loads of even coverage real quick.
Likely not a patch on those industrial ones you see professionals using but I’ll likely get one when it comes to painting the fence outside in summer. I can then practice to see how it would hold out indoors.
VOC (volatile organic compounds) so ideally you want zero or low.
It should have a sticker on the tin. (But might be written instead, probably on trade tins)
If you are using high/v high you might want a respriator.
Got one on those coming today from Amazon. Glad I didn’t pay them the £4.99 they wanted, for next day delivery and just went for the free it’ll be with you by Tuesday option. Still getting it delivered next day with no extra postage fee.
This is why I pay something else - a better job and in less time.
I found the data sheet for what I’m using it does say to avoid breathing in the vapour and to wear a suitable respirator. That’s arrived now at least so I’ll be able to finish the job without nearly passing out.
I hate it as well, but the obvious solution is to just pay someone to do it. The decorator will probably use less paint as well, so the overall cost might be more comparable than you think.
Oh hell no, as much as I hate it I’m not paying someone to do it
You can get stain block paint that you paint on the effected area and then repaint over.
I had a salty/wet/shiny stain from my aquarium water on the wall and it sorted that. It usually covers most stuff, like grease and water damage but it depends on what kind of marks they are.
Highly recommend using trade paint to be fair. Crown do a whole host for different scenarios, granted they cost a bit more than what you would pay from a chain DIY store but they do the business. Dulux also have trade stores which do similar, it’s a further walk from me so never used them before.
Sounds like it’s going to be a never ending battle whatever you do, so biting the bullet and getting it repainted with proper paint is the only good long-term solution 
You do like sharing websites
Not sure what garage floor paints have to do with any of this. I can’t see anyone mentioning it 
Bad bot! Go to your folder!
I can’t work out if these are people roaming about Discourse forums looking for threads to post links in, or a semi-sophisticated bot that can pick up the general subject of a thread and match a spam link to it.