Metal paint bucket
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How to old latex paint out of a metal paint can
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Try paint thinner.
I would use a paint stripper.
I usually just peel the dried latex off. Pick at it with a flat screwdriver to lift a portion and peel away. If the paint is too thin, hot water and dish detergent, let it soak for a while and it will scrub right out.
You might have to go to a paint stripper if other methods don't work.
I can usually cut and peel most of off. If there is any left, got water and some dish soap will loosen the rest. Stay safe!
Anita
Are you trying to dispose of this paint? if so here is some ideas for you
https://www.truevaluepaint.com/paint/interior/prep_cleanup_and_safety/leftover-paint-disposal.aspx
https://www.popularmechanics.com/science/environment/a3098/paint-disposal-options/
Did you want to use the can for a project?
Try this! https://www.hunker.com/12455127/how-to-fix-dried-out-paint-in-a-can
You should be able to peel it out try with a sharp knife be careful to start it .
Use a primer for metal and use 2 coats of outdoor paint.