Hey, I just finished my pepakura helmet construction. Joints are held together with hot glue on the inside and regular elmers white glue has been smeared on the outside to help strengthen them. The joints seem secure but the helmet itself has a bit of flex and give to it.
I don't have the space, resources, or expertise required to use fiberglass and resin to strengthen the helmet, and I was planning on doing paper mache but on a test mask I did months ago, it turned out kind of sloppy. I was reading Antmans tutorial, and he says to use bondo, but it looks more like a spackling paste he used in his pics. But from what I've read, people say that the spackling paste will begin to crumble and fall apart because its so brittle. I need to even out the edges on the dome and cheeks a bit, but I have no idea what product to use.
As far as a sealer, I have heard to use polyurethane spray, or miniwax polycrylic sealer, etc. Not sure which product to use, or when to apply it.
Then again, the paper mache mask I made is pretty solid, so I could paper mache the inside of the helmet? But that doesn't help even out the edges obviously.
Advice/input please? I haven't seen this topic covered in the stickies, and other threads mention using fiberglass, which I'm going to pass on.