Hello, the signature strip on the credit card is specially designed to prevent others from altering the original cardholder's name after stealing the card: firstly, it is very thin; secondly, as long as it is smeared with chemicals, it will easily break holes and change color to show the word "VOID" at the bottom. So if the signature is wrong, you can't use chemicals to alter it.

if there is something wrong with the signature, you can cross out the original one (not all of it is covered, just draw a horizontal line) and re-sign it next to the signature bar. In this case, it's best to shop with your ID card-especially when you spend a lot of money, so as to avoid the merchants asking for identification.