With better latex based paints and a new product called oil bond on the market today painting over oil based surfaces is actually easier than ever before. Because latex paint has built in flexibility it doesnt make the ideal base for oil paint which has a hard finish.
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Furthermore if you were to use an oil paint over latex the new paint will expand and contract at a different rate than the underlying layer causing it to crack.
Can you use oil based paint over latex. Those terms dont necessarily mean much to the average homeowner but what is important to you to know is that latex paint shrinks as it dries. The truthful answer to this question is that you shouldnt paint an oil based product directly over latex paint but it can be done if a sealing coat is used to separate the layers. Latex or oil based paint can be successfully applied over oil based paint.
But you need to do it properly otherwise your project will turn into a disaster. Latex will not properly stick when applied directly on top of an oil based layer without preparation and may easily crack or peel. Oil based products dry through solvent evaporation and oxidation whereas latex dries by solvent evaporation and coalescence.
As long as the surface is fully cured there is nothing inherent in the oil based paint coating that precludes an additional layer of latex or oil based paint. You can paint over oil based paints.
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