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.