semi-gloss paint for the interior - what is the difference between enamels and latex?

Latex: water based, you can wash your brushes with water, clean off any mistakes quickly with water, etc.

Enamel: you need paint thinner for all clean up. It is based on some kind of oil, water won't touch it.

As far as I have experienced, both work very well, so I always use Latex (after it dries, no problem, even with strenuous water washing.

With respect to paints enamel is a fanciful term, implying that an ordinary latex or oil-based paint has the same properties as true, fired vitreous enamel. Some enamel paints have been made by adding varnish to oil-based paint. The term sometimes refers to oil-modified polyesters that were introduced in the early 1930s. The oil is required to stop or enhance the crosslinking of the paint in order to achieve sufficient flexibility of the paint film. Typically the term "enamel paint" is used to describe oil-based covering products, usually with a significant amount of gloss in them, however recently many latex or water-based paints have adopted the term as well. The term today means "hard surfaced paint" and usually is in reference to paint brands of higher quality, floor coatings of a high gloss finish, or spray paints. Most all interior paints are acrylic latex and are water based. An Oil-Base High-Gloss Enamel has Exceptional adhesion on previously painted or properly prepared and primed surfaces such as interior and exterior wood, drywall, plaster, masonry, metal, well-bonded wallpaper, brick, stucco, aluminum and cinder block. Not recommended for floors. NOTE: All oil-based paint yellows over time. This natural effect is most noticeable with light colors applied in areas with limited exposure to sunlight. It also has to be cleaned up with mineral spirits. Best for outside use. You should use a resperator if you use inside. Hope this helps

the above answer is correct as you tried to paint oil over latex,let it dry ,sand out the bubbles,then spackle them if needed,and get a latex enamel and paint the topcoat with that ,you should used an oil based primer ,then you would have been fine as you can paint latex over oil, but not the opposite....painting contractor