Polyurea spray to mold halo parts

electricknite

Member
If you've seen Testeds latest video on Adams martian suit, they molded the chest...armor?.. with polyurea spray, which looks like it'd work really well for halo armor. They sprayed into a mold and pulled it but i wonder if you could spray it into a pepakura shell instead of using resin and fibreglass. they say it cures instantly which would be super handy and minimize sagging. plus its got some flexibility to it.

If anyone has used it, even for its intended purpose of lining truck beds please comment with you thoughts and experience, its sounds too good to be true.
 

TurboCharizard

RMO & BCO
405th Regiment Officer
Community Staff
If you've seen Testeds latest video on Adams martian suit, they molded the chest...armor?.. with polyurea spray, which looks like it'd work really well for halo armor. They sprayed into a mold and pulled it but i wonder if you could spray it into a pepakura shell instead of using resin and fibreglass. they say it cures instantly which would be super handy and minimize sagging. plus its got some flexibility to it.

If anyone has used it, even for its intended purpose of lining truck beds please comment with you thoughts and experience, its sounds too good to be true.
Very interesting. As an elastomer it could be very good for flexible sections on armour and tech suits. Might be worth playing with in small batches with some old moulds.
 

xXDashIVXx

Well-Known Member
If you've seen Testeds latest video on Adams martian suit, they molded the chest...armor?.. with polyurea spray, which looks like it'd work really well for halo armor. They sprayed into a mold and pulled it but i wonder if you could spray it into a pepakura shell instead of using resin and fibreglass. they say it cures instantly which would be super handy and minimize sagging. plus its got some flexibility to it.

If anyone has used it, even for its intended purpose of lining truck beds please comment with you thoughts and experience, its sounds too good to be true.
Please test this out!
 

Drsalmon616

New Member
In the video frank said it was basically truck bed linner, so I wonder if you can buy a can of that and rotocast it instead of spraying it.
 

TurboCharizard

RMO & BCO
405th Regiment Officer
Community Staff
So I had an hour or so of downtime yesterday for the first time in ages and I went digging. Polyurea is one hell of a rabbit hole to go down.

From what I can tell "truck bed liner" is technically true but not all truck bed liners are created equally based on the mix ratios for different polyurea applications. I went digging for spray polyurea which led to a series of instructional videos for surface coating of industrial chemical tanks. If you're interested in a two part application which requires a specialized sprayer that has two separate lines operating at different pressures for mix ratios it's only $600 for a 10 gallon kit. I honestly didn't want to get a quote for the spray applicator.

I then went into the land of DIY spray truck bed liners and checked out their material data sheets and couldn't come up with anything that was polyurea, just a bunch of polyurethanes and other resins. Things like EZ Liner and Dupli-Color Truck Bed Coating could be possible options but based on the data sheets I'm not hopeful of great results. The list of chemicals I was looking for was the list of commercial urea resins and other generic names.
  • JEFFAMINE® (Polyetheramines)
  • SUPRASEC® (Low-functional Isocyanate Pre-polymer)
  • JEFFLINK® 754 (Aliphatic Chain Extender)
  • UNLINK® 4200 (Aromatic Chain Extender)
A lot of these are available through specialty shops that bring equipment to you or you take your vehicle or whatever you want coated to (Rhino Liner, ArmorKote, etc.)

The closest thing that I could find that was pure polyurea and publicly available in non-specialist stores was Rustoleum FastKote but it is a 24 hour cure time and a brush on product for flooring. It might work, maybe if there was a catalyst that could be sprayed on it'd set quickly after brushing a layer onto the inside of a mould. There's other brush on options out there but a quote was required and I wasn't in the mood for ordering 20kgs of product from the UK.

Moral of the story is that to get a spray application like Frank is talking about, you'll likely need access to expensive specialty tools like ones that are available in his shop.
 

Sean Anwalt

RCO
405th Regiment Officer
TOO GOOD TO BE TRUE!

I was a little bit interested myself. I feel like the amount of work that went into this, though, far outweighs the work to mix up a batch of the good ol' tried and true 50/50 water and white glue, or crackly old Mod Podge.

Thanks a ton TurboCharizard for the research. You'll receive a bonus in your 405th check for this! ;)
 

TurboCharizard

RMO & BCO
405th Regiment Officer
Community Staff
TOO GOOD TO BE TRUE!

I was a little bit interested myself. I feel like the amount of work that went into this, though, far outweighs the work to mix up a batch of the good ol' tried and true 50/50 water and white glue, or crackly old Mod Podge.

Thanks a ton TurboCharizard for the research. You'll receive a bonus in your 405th check for this! ;)
Is the bonus an AP-2 polyurea spray applicator?
 

wasili

New Member
yes, Polyurea has an expensive setup. It's incredibly strong and is used a lot for movie armor. It's even faster than what Frank is mentioning in the vid.

Afaik Frank does not have this setup at his workshop. I think the parts for The Martian spacesuit in the YT vid were supplied by FBFX, including the 3d files.
 
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