Just want to make sure that I don't buy too little and have to buy more, how much resin (I'm looking at epoxy) would typically be needed for a helmet. I know size of helmets differ, but I'm just looking for a ballpark figure. With what I'm considering buying it would be about 1kg - 1.2kg of resin I would purchase, which I think should be enough, but still it can't hurt to check.