I'm gonna be using a CHUG Cyclonus head for a custom. I am gonna cut out his "horns", fill them, and sand them flush with the helmet. It seems to m ethat plastic putty is actually kind of weak (might be wrong, tho.). Krazy glue and baking soda might be good for gaps- but is this too big of an area? What should I fill this with? The head is ultimately going to be painted gloss white with a yellow area toward the top. Thanks in advanced.