It depends on how bad it is and how good you want to make it. I do a full correction every 12k miles, using Menzerna Steps 1, 2 and 3
https://www.amazon.com/Menzerna-400-...85758601&psc=1 sealing it with Power Lock
https://www.amazon.com/menzerna-PL25...15312323&psc=1 Every spring I do just Step 2 and 3 and Power Lock. There are more how to do it videos on youtube than you can shake a stick at.