Best way to get white gloss paint off of helmet?

[CrookKnight[TK]]

I have a major issue.  I am building a scouttrooper for my 7 year old son.  I had already put 2 coats of white gloss on the helmet, when about 24 hours later I went to put on the final coat everything bubbled up and half of it peeled off.  Now the remainder is on really good.  Other than sanding, anyone else have any good ideas?

[humperdingle]

What's the base helmet material?

[sylverbard[TK]]

Elbow grease. You need to sand between coats anyway, this will just make his bucket shine more.