Heres a tutorial of how to make the helmet the way I did.
1) glue together your pep model. Add detail like side pieces:
http://i78.photobucket.com/albums/j115/gam...17/pephelm5.jpg and brim pieces:
http://i78.photobucket.com/albums/j115/gam...17/pephelm7.jpg
2) gather cardboard from packing boxes and also thin cardboard from cereal boxes. Glue them to the inside so there is about a 1/2"-1 inch gap in between 2 pieces. Foam board can also be used, but is very hard to work with.
Coat the inside with hot glue by:
A: Melting mass amounts of hot glue like frost said and using brushes to layer the inside.
or B: taking a hot glue gun and soldering gun. shooting hot glue inbetween gaps, and smoothing
out using a soldering gun. (my way)
example:
3) after applying to the entire inside: go back and re-enforce weaker areas. Do this by spreading the hot glue in layers.
Try to coat over the cardboard so it becomes water proof.
4) Go to the automotive section at your local walmart and buy bondo spot putty, truck bed coating, and plastic spreaders. (primer if you don't have any)
http://i78.photobucket.com/albums/j115/gam...ruckcoating.jpg
http://i78.photobucket.com/albums/j115/gam...7/spotputty.jpg
5) Spray one solid coat of primer on the out side to bring out any imperfections.
6) Take your spot putty and plastic spreaders and apply a thick coat to any imperfections or areas you want to smooth on the out side. Squeeze a good amount out and spread it around w/ the plastic spreaders.
NOTE: You do not have to coat the entire helmet. You need to wear a respirator. The putty
WILL crack.
7) Wait for it to dry and then sand with 200-400grit sand paper. It was about 50 degrees every day I worked so, I had to wait 24hrs for the putty to dry.
8) Once dry take the putty and fill the holes and try to make cracks smaller. Then sand again.
Depending on how the helmet looks; spray a coat of primer on. If you still find imperfections repeat steps 6 & 7. Small cracks and holes are ok. The truck bed liner will fill them.
9) Take your truck bed liner and shake it up for a good amount of time. Spray a solid coat on to the helmet. I waited 30min-1hr for it to dry. After the first coat is dry, spray thin coats every 30 minutes or so. Focus on cracks and holes until they are gone.
10)Once you are happy with your helmet and texture, you are ready to start the final paint job.
Tape off any areas you want to keep black. ex: side detail, under brim detail, nose area, etc. Use masking tape.
11) I used the same color of oregano that Adam used on his armor. Spray 2-3 coats.
12) Take off the masking tape. If you taped it properly the paint should not have gotten to the black areas.
I did not so I had to go back w/ model paint and fix the mess ups.
Thats all for now. I just need to add a visor, padding, and finish my lights.
Good luck
PM me for any questions