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Household paint
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Posted
Household paint is designed to last for a limited period of time - i.e. to the next touch-up of the hallway. Now - it MIGHT last a hell of a time - a lifetime, maybe, so long as it's not actually exposed to UV light, knocks and scratches, dirt seeping into it (all acrylic is quite soft and vulnerable to staining over time, but household acrylic just isn't designed to resist these pressures - there's no reason why it should be expected to). Beyond that, though, the colours are just not the same as artists' acrylic: that may not matter so much if you only paint in dark umbers, but it does matter a lot when you seek to get into bright, strong colours - eg, cadmium colours, which housepaint generally doesn't use, because it would be VERY expensive over large areas.
So the answer basically is 'yes but no'. It may not matter if your kitchen décor gets dirty, fades, dulls down over time: but if you're selling paintings, it really does: get yourself some Cryla, and then some household acrylic, compare the two - chalk and cheese.
You MAY be able to paint underlayers in household acrylic - well, you could! But - given it's not designed for the purpose, could you trust it not to crack, flake, peel? It might well not - but it's not a risk I'd want to take.