I thought that they weren't permitted, but may be wrong. If it were legal and beneficial the Aussies would be doing it already.
You're right, Johnny. They're not permitted. They were used by some players for a short time 20 years or so ago and they were banned shortly afterwards, after minor injuries were caused by them.
GAA players often wear smooth surfaced gloves - personally I wouldn't have an objection to those - but the fact is that the balls are much easier to grip than they were 20 years ago and maybe they're just not necessary any more.