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New To Painting MDF
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jennifer:
     Wipe it off with thinner rags and start over.
nedley09:
so no on just painting over the sanded parts with an egg shell paint?
Le Chuck:
I wouldn't topcoat a partially dry partially sanded latex paint with a different paint. Latex shouldn't be "sticky". It's the most common interior wall paint in America, are your walls sticky?  Since you already started sanding I'm with Jen, remove it all and start again.

The effect you're getting is called Blocking. It occurs when the paint isn't allowed to cure. At 75 degrees F the cure time for a thick coat of latex is weeks to a month. Other paints like enamels have much shorter cure times and are more durable but are also more expensive and can be trickier to work with. You can ask your paint store to add a curing agent to the latex paint to speed drying if that's how you decide to repaint.

I'd get the latex off and use an enamel.
nedley09:
ya i was afraid of that.  My only issue is its 20 degrees outside and i am working in my basement.

The fumes from the thinner might cause problems for me, my wife and cats
jennifer:
      Just push it over by the door , open a window, and get it off of there...You, wont get a get a decent finished result by topcoating a messed up base, If you wait to long you will have to use stripper and that is really stinky and considerably more caustic. Just soak a rag and wipe it on, good and wet and with the other hand wipe it off with a dry rag. Work the whole cab this way so no one spot stays saturated, just keep working around it till the paint reacts and falls off, It will take some time and alot of thinner and rags, then let dry and seal and paint again. ...The cats will hide, and your wife, Well, perhaps send her to the mall before you start...Jennifer loves the smell, Maybe she will too :-\
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