If anything, I think going PT can help job prospects.
My experience is that nobody holds PT status against you, but your job experience can only work for you.
From what I've heard, there are no substantial differences for PT vs. FT regarding job prospects after graduation. The degree does not distinguish and the transcript would only give it away because there would be fewer classes during the fall and winter semesters and more classes during the summer when compared to a transcript from a FT program.
I suspect it would be MUCH easier to get work experience in a PT program because you can apply during the fall, winter, and summer instead of just the summer.
Perhaps it's slightly easier to get admitted into a PT program than a FT time, but if you have no shot of getting into school x, you're not going to sneak into the FT program. If your grades are reasonable, I can't imagine it having any substantiative impact on job prospects.
Finally, I don't really think you need to have an air tight reason for doing PT or an explanation for not working during the day - don't PT students need to study and read too?