Sure! And if the white-out does get clumpy, you can always photocopy it for the FAX machine.
I need to fax a paper to a branch of the Federal Government, I made a date mistake I put 6/6/2016 and it should be 7/6/2016. Now, I can white it out very neatly, should I? Since, I will have the original.
They might frown upon that but if you do a really neat job, it should fly. Hard to tell sometimes with government paperwork. Be better if you had another copy to fill out and date right.