I spent a little time cutting out excess hot glue to make the helmet slightly smoother, and making the helmet's surface a little more flush. I then sanded everything down to make it smoother. Sanding the PLA plastic can sometimes be a challenge, since heating it up (with the friction of the sandpaper) can cause it to chip and flake off. So I only used the power sanders on the hot glue, and in small intervals on the plastic.
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As soon as the helmet was free of any sharp edges left behind by the supports, and it was relatively smooth all around, it was time to seal it. I first made a test area on the inside of the helmet. This particular sealant came in two bottles, and when mixed together, they chemically change in order to achieve the right consistency; however, this also meant that the mixture gave off heat. By testing on the inside of the helmet, it ensured that the sealant wouldn't melt the plastic and ruin the helmet.
After the first layer of the sealant was on, I had a lot of sanding to do. This stuff sands down very well, and as long as you have patience, can make the helmet almost seamless.
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I first coated the helmet in a couple layers of Plasti-Dip, since it is able to be removed. One day I would like to sand the helmet even more, so being able to remove the outer layer of paint will be helpful in the future. After the Plasti-Dip had dried, I put two layers of the silver spray paint I used for the armor.
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