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I used a full 2 gallons to fill that bucket. I still think letting it soak in the peroxide helped whiten all the nooks and crannies, but I think that letting it sit in a shallower bath and brushing on the developer for the top and eye sockets worked well too, and it wouldn't be nearly as expensive. After a week of drying or so now, the head has whitened substantially and looks awesome! I'm very happy with it. I am in the process of putting together a plaque from some old weathered cedar boards I had laying around. I think it will look really good when its done.
What does everyone do once the skull is whitened and dried to seal them? I've read of matte finish polyurethane, or spar varnish, etc... I'd also like to keep the bark and junk at the base of the horns, do you think coating it with either of the above would work?