I don't see any reason to paint the inside of a fiberglass helmet other than for cosmetic reasons. The fiberglass will eventually lose the smell it has over time. A nice alternative would be to line it with felt or something similar.
Thanks guys. Its the splinters I was worried about. Didn't know you could sand it and not worry about it. I was thinking you had to seal it some how. I think I'm still gonna prime it though. Thanks again!
You're talking about a MSH, right? Mine came with a raw fiberglass finish, and don't want to put your head in that! It's ruff FG, and you need to seal it with either bondo or more fiberglass resin. I sealed mine with an extra coat of resin, about 2 oz. If your going to line your bucket with fabric anyway, you could skip it. But I'd do it just to be on the safe side.
I didn't realize that the inside of your helmet was rough. When I built mine, I did the same thing as Boba Phat & smoothed out the interior with a couple of extra coats of resin. Just for the record though, I did paint the inside of mine. I wanted it to look more finished than raw fiberglass.
Yes, it is the MSH. Will the fiberglass resin I've seen at Walmart work in the automotive section? Thanks for the input guys. I really appreciate it. The foam idea sounds like the route I'll go thanks SC. I just had seen some at the local craft store.
I also recommend foam to use as liner inside the helmet, specially the grey colored one used for audio , electronics packaging or music acoustic purposes. There are different kinds of foam thickness and shapes... the choice is yours.
The FG resin from Wal*Mart will work. I get mine from Home DePot. Pick up some mixing cups, craft sticks, and some cheap brushes. Mix the resin and the MEK peroxide, pour it into the helmet, and brush it up the sides. Keep working with the resin until it sets, and you're done!