Best way to stick down edge of OEM decals?

[TiminYorkshire]

A couple of the original decals on my KTM are lifting very slightly at the edge.

What's best to stick them back down? And what method to use so I don't get glue or similar everywhere?!

Thanks for the anticipated PH advice.

[Biker 1]

I've had 3 KTMs over several years - the quality of decals was crap on all of them. I would peel off all the duff ones with the help of a hair dryer