rank 1 first aid

Would it be possible to use skill training seals purchased from the seal merchant to get rank 1 first aid? haven't tried it yet but it doesn't seem like there are any restrictions on what skills to use the seals on besides non r1 skills

First aid is capped. That means the rank up button doesn't appear when you 100 prof train a skill. Don't even try it because you'd be wasting seals.

Theoretically, yes, you could push it. But Info is right. The "Advance" button will not appear since it is capped. I mean, it doesn't hurt to try and get it ready to be ranked when it does get uncapped, but I wouldn't put the effort into it.

Inb4 the next uncap task is a super easy one

That is rather unfortunate, considering a lot of RP characters have Rank 6 and above of this skill. If I remember correctly, Millia has rank 1 of this.

Similar situations like Mana Shield have a rank button but cannot be used, even though you can fully train that rank. Considering the skill actually does have entries for unreleased ranks, unlike newer capped skills, there is a slight possibility they might have messed up and not set a rank restriction other than training method. Though very doubtful, I'd say only waste it if you have nothing else to waste your seals on.

I thought the rank up appearing for Mana Shield was a glitch? And if they did mess up and First Aid is rankable to 1, wouldn't that be glitch abuse?

It was a glitch. and I'm pretty sure there's some sort of flag/precaution in place so it wouldn't be rankable.

For the record, I had fully trained Rank 6 Cooking before it was available for rank up and the button did not appear. I expect it to be the same for First Aid.