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Can I Just Paint Over Old Paint? [Solved]

If the current wall is smooth, clean and covered with the same type of paint (both are oil-based for example), you can head straight for the paint. You need to fill holes, spackle and sand*, maybe even cut a new piece of drywall in to the existing wall.

Do I Need To Sand Before Painting

http://how-to-

Painting Over Paint: When You Can and Can’t - Kevin Tetz has the Answer at Eastwood

Not sure if you

When You Should Strip Automotive Paint & When You Can Paint Over Paint

This video briefly explains why there are times it would be better to strip automotive