Luigi might be two timing ....I just replaced a shoulder belt in an '02 Accent with similar damage. There was no Loctite on the original fastners nor the mint used replacements.
I think Ford uses something on some of their trucks though. I've broken a large torx bit on Ford seat belt bolts, mid 90's style cabs. Can't keep spark plugs in, can't get seat belt bolts out.
Oh, I forgot but the OEM replacement belt did come with all the fasteners pre-installed, and the top bolt came with blue Loctite already on it as did the bolt that came out. The fact that it came with brand new fasteners, spacers and washers was a nice surprise. I figure that's liability CYA right there.