In many states - Florida included - a DUI plea comes with a mandatory conviction, or adjudication. Few states, if any, withhold adjudication on DUIs. This is because anti-DUI advocacy groups have put tremendous pressure on politicians to pass tough DUI legislation. That is why first-time DUI offenders can be saddled with over $10,000 in fines and costs, months of restrictive probation, driver's license suspensions, and time-consuming probation requirements. Above all things, though, the conviction that a DUI plea carries will stay with you forever.
In Florida, you cannot seal a conviction. And if you have a DUI conviction on your record, you cannot seal or expunge ANY criminal record, even one completely unrelated to your DUI.
If you have ever pleaded guilty or no contest to a DUI, you are likely ineligible to seal or expunge your record.