It is very difficult to remove latex paint from rubber weatherstripping due to the fact that it is porous material. It means that the paint is seeping into the rubber and removing it may cause some damage to the material. So that there are only two options, use some alcohol or simply buy new rubber weatherstripping.
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Pick up a little can of Goof-Off and see if that does the trick. Be careful to try it on a hidden part of the rubber to make sure that it will not soften it.
If I was going to repaint this, then I'd remove both the latex and the old oil base with a chemical stripper. Then re-prime it and paint.
You can try using denatured alcohol if it was latex paint. But it is probably cheaper and easier to just replace the vinyl cove base.
The ingredient in glossy paint is acrylic. You cannot remove that ingredient.
I found out that Rubbing alcohol will remove dried latex paint on hard wood floors.
you can paint over latex paint with latex enamel.