Step 11: Resin casting & trimming

To make a copy of your helmet with urethane plastic, you'll use a process called "slush casting"

The video below is pretty dry, but it gets the general point across. Skip to about 4:20 to get the the relevant information, though there are some good tips about mold prep beforehand as well.

For my helmets, I use Smooth-On's 300 or 320 urethane casting resins. Start by mixing 2 cups of resin (1 cup of part A mixed with 1 cup of part B) and pour it into the mold cavity, rotating it slowly by hand as the resin cures.

Repeat this process, moving the mold around to cover all areas of the inside of the helmet, until a uniform thickness of 3/16" is achieved. If some spots are a little thicker, that's fine; slushcasting is a tricky process that can take some getting used to. One helmet usually takes about 32oz of resin.

Warning! I did castings in both polyester and urethane resin - the poly is lighter and thinner, but more brittle. Urethane can deform and its heavier, but much more forgiving when subjected to stress. Whichever resin you choose to go with, read the MSDS (material safety data sheet) and make sure to use a resin that can stand at least 140º of heat. Shipping a helmet in the summer to a chrome shop can subject it to 120º+ in a shipping truck, and the chroming process itself can be quite warm as well. Some resins, like Smooth-On's 65D Roto resin, have lower melting temp and can deform very easily.

After the helmet is fully cured, remove it from the mold and trim out the areas for the visor, ears, mouth and nose vents using a dremel tool and hand files. (pics 3 & 4)

Materials needed:Tools & supplies needed:
  • Disposable mixing trowels
  • Mixing cups
  • Sandpaper
  • Detail files
  • Dremel tool
  • Cutoff wheel for dremel tool
  • Sanding drum for dremel tool
  • Rubber gloves & smock
<p>do you sell or offer a pre assembled visor kit, or know where one can be acquired for those with little electronics experience?</p>
<p><strong>For the silicone Rebound 25 do you think I could get away with just using 2 of the trial kit or would I need the full gallon kit?!</strong></p><p><strong><br></strong></p><p>http://www.smooth-on.com/Rebound%3D-Self-Th/c1132/index.html?catdepth=1</p>
<p>why is it punk?? </p><p>Looks like a startrek/pick a sci-fi helmut, but not punk.</p><p>It is quite awesome though!</p>
<p>daft punk is the name of the musician. </p>
<p>AHA, </p><p>I see, I could not imagine how that was &quot;punk&quot; then I did as two suggested and followed tghe links, plus I wiki'd it. The outfit was a gimmick to sell music. Well it worked for KISS why not someone else. </p><p>great work making the thing, but pointless unless you are making a movie, or going to a party, (for a while anyway). I carve and have made quite a number of useless pieces. Chach-ki's (Yiddish for dust collectors)</p><p>Again, wonderfully done</p><p>thanks</p>
<p>But the reason that they wear the helmets was to remain anonymous and be recognized for their music.</p>
<p><a href="https://en.wikipedia.org/wiki/Daft_Punk">https://en.wikipedia.org/wiki/Daft_Punk</a></p>
<p>Thank you for all the insight on this build. Building this from scratch was very fulfilling,....tough but sooo worth it! Guy Man is next :)</p>
<p>Hi, what an excellent instructable! A mix of electronics and props... A lot of hard work has clearly gone into this project. </p><p>Karl</p>
<p>In oddly crazed digression - say you were to do this for the head/face of a friend and make a mask of them and sneak into a pumpkin patch early in the season and have the pumpkin grow into the mask. Remove the mask and you have the face of your friend as a freak of nature.</p>
<p>I'm speechless now! :D Awesome!</p>
<p>What a craftsmanship! This is incredible! Congratulations on it. Maybe I will try it one day. Just astonishing!</p>
<p>Now I just need the dietary supplements to get my head inside comfortably :) Some kind of phat burner.</p>
<p>How much did it cost to chrome your helmet?</p>
<p>I have the same question. Spray painting with &quot;chrome&quot; paint is not the same as chroming.</p>
<p>Well Mathew, you can get the chrome paint at your local AutoZone for around 10 to 20 bucks.</p>
<p>I wish I had received this email 4 months ago lol. I just bought a Thomas one off eBay and a Guy one from Etsy</p>
<p>though I should add these were premade molds that may not fit my head and there's no LEDs.. I wish I had the right money to blow on Volpin's products</p>
<p>Have you had anyone buy one from you yet, volpin? I wish I had the money.</p>
<p>Can you see out of this?</p>
<p>Greatly detailed work, I wish I had the skills to do this project. Do you sell them? If so how much.?</p>
<p>He takes 25k for a fully finished one.</p><p>See my more detailed answer to lukesjette.</p>
<p>oh...WOW! I wish I could afford it, my son would love it. He's been asking me for a daft punk helmet. Again GREAT JOB! Thanks for the reply . </p>
<p>r they for sale</p>
<p>Completely finished one is 25k. Yeah, no joke there. It takes a long time to make one, and the parts and electronics used are really expensive.</p><p>Plus, Harrison Krix (aka Volpin Props) is a professional and likes (also deserves) a good hourly wage.</p><p>Don't believe me? Check out his shop:</p><p><a href="http://www.volpinprops.com/product/completely-finished-daft-punk-helmet-replica/" rel="nofollow">http://www.volpinprops.com/product/completely-finished-daft-punk-helmet-replica/</a></p><p>You can get the slush-cast resin base for much, much less but it's still in the triple digits. Or the blueprints for making your own one for a fiver.</p><p><a href="http://www.volpinprops.com/shop/" rel="nofollow">http://www.volpinprops.com/shop/</a></p><p></p>
Oh that's a bit much for me ?
<p>Excellent Instructable Job!!!</p>
<p>Holly Cow that sure is a very detailed instructable.. But I like seeing all of the steps and the patients to the detail is very well defined in the casting process... These very same products, helped me out many years ago, when I was doing house painting on the side... Well anyway I had a problem with a ceiling decorative pilaster, that had been broken for many years, and the customer asked if I was able to save it... After doing some checking around the painting community, which hung out in the mornings in the local paint shop...A couple of guys recommended a product some what similar to this, and needless to say I was able to repair the decorative ceiling pilaster with it.... It made me very popular with the clients, and a lot of their friends who had similar problems with their apartment ceilings...! These where old apartment houses that were converted to condo's by it's tenants, and kept me working for a long time and even generated enough business to hire on a couple of helpers, and 2 other painters.... So believe me folks this stuff works wonders... The only thing is I believe if my memory serves me correctly is that the process I used was not as complicated as this product seems to be.. But I'm talking back many years ago as I was paying my way through school, so I could be wrong..! But non the less a great Instructable ...!</p>
<p>Excellent Instructable. You are truly a dedicated and talented craftsman. Thanks.</p>
<p>WOW! Almost too cool to be true ;)</p>
<p>Wow, totally amazing and artistic work.</p>
<p>Harrison! I saw you on tested!</p>
<p>This is really brilliant! favorited!</p>
<p>This is truly incredible! One of the best helmet I ever seen :o</p>
<p>The word Awesome was invented for things like this!</p>
Can you use plexiglass for the visor and still dye it the same way?
<p>That is just ridicuously awesome!</p>
<p>name your price volpin.....</p>
<p>Around $3000</p>
lol dude i could buy like 5000 tickets of his show with that much.<br>I know u r trollin wid me
<p>I guarantee you cant buy a ticket for $1.66 and he's not dude: http://www.ebay.com/itm/Daft-Punk-Full-Led-Gold-Chrome-Helmet-Includes-Gloves-Necklace-And-Stand-/191424388473?pt=LH_DefaultDomain_0&amp;hash=item2c91c85d79</p>
<p>That would be $0.6 per ticket ;)</p>
Would you sell a premade visor pet plastic screen? I don't own a drill press
<p>I don't know if this is what you want but they sell the LED frame here:</p><p>http://www.volpinprops.com/product/thomas-helmet-subvisor-frame-led-holder/</p>
<p>Is it possible to see in it xD</p><p>Just wondering ya know</p>
<p>Hey IF i were to buy the helmet from u how much would u offer it for? 30$???</p><p>email me i anyone wants to sell me one of these? syed.ali165@gmail.com mail me!</p>
<p>Are you serious? The supplies alone cost much more than $30. I'd imagine many would sell theirs for at least $750.</p>
<p>Its true! Heres one going for 3000 dollars!</p><p>http://www.ebay.com/itm/Daft-Punk-Full-Led-Gold-Chrome-Helmet-Includes-Gloves-Necklace-And-Stand-/191424388473?pt=LH_DefaultDomain_0&amp;hash=item2c91c85d79</p>

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