If it's just on corners you might not, but if it's on a flat section, the areas adjacent to the sand throughs are going to be thin and prone to sanding through. Especially since you have several grits plus buffing to go through still. Like I said, if the corners are where you have problems, you probably won't chase it around. Don't wet sand any more than you absolutely have to on corners so you can keep a good build for buffing.