Sticky Enamel

Agreed with most all of the above. You really have to stir the paint thoroughly to remove the stickiness. I have found that if I do not, that is the result.

Bad bottle. You'll need to strip off the paint and start over with a fresh bottle. Hope I'm wrong, but prepare yourself to start over...

I have been finding out that the new Testors paints in the small bottles do not last like the older ones. I had a couple of them not even 2 years old go bad on me but yet a bottle that's 15 years old is still good. Did you stir the enamel really well and did you place the figure in an area were it is properly vented?  

Enamel paints are oil base and most of the time it is dry to the touch and they are not.Heat sensitive.Most Figure painters use acrylic and water base paints that are in many more colors that in enamel.Colors will never bleed through each other and easy to apply.

Sounds like it needs more curing time.  I've taken one of those clear plastic totes, flipped it upside down and placed it in the sun with a model underneath.  Makes a nice curing oven.  If it's really hot out you'll need to keep an eye on it as it can get pretty hot in summer months.

You may need to find a way to heat it- stick it by a sunny window or something.  Do not put anything over it until it is thoroughly dry. I love Testors enamels, but they are slow drying.  And, they go bad sooner than most other paints.  If there is any question in my mind about an old bottle of paint I pitch it in the trash. I also built a homemade drying box, using a 60 watt incandescent bulb as a heat source.  It works great, runs about 105 degrees and cuts drying time down to a day or less instead of several days.