The sealer *might* help, but probably not for long. The problem is likely underneath the paint that's cracking. Still, it's worth a shot!
Matte medium might also work for you, but you're going to have to be careful applying it. It will dry clear and is a little thicker than aerosol sealer or anything you would apply w/ an airbrush. Gently, and I mean GENTLY brush it on so that it covers the area. It should help bind what's there. I would definitely test it on some out of the way spot on him first though.
Thin super glue might help, but it also might not dry totally clear and makes things worse.
Good luck!
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