I'm taking a guess that it is Latex Paint. The best and fastest way would be to use a Paint Scraper. Stripper would work but it would take the Final Finish off of your floor. If it is a large area, you could use a Heat Gun...carefully as that also would take the Clear protecting coat off of the floor. I would go with the paint scraper. Not a Putty Knife, a Paint Scraper.
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Yes, you can put polyurethane paint over eggshell in latex or eggshell in oil.
Yes, eggshell paint is good for doors.
No, because eggshell paint is intended only for indoor use, like kitchens or bathrooms. For exteriors, use paint with a satin finish.
You can, but don't need to use additional primer.
You probably can. As long as the masonry paint is 100% acrylic, you will have no problem at all using it on a wooden porch ceiling. Using a cheaper vinyl paint is not suggested on wood though as it will craze and crack over time.