Well, i gave it a go and was pretty impressed. I only used a blue shop towel as a brush since i wasn't quite sure what to expect and didn't want to waste brushes. I bought the JDiction New Formula. A quart (1000g) is currently $35, though i bought 400g at $20 for the test.
Amazon.com: JDiction 400g UV Resin, New Formula Crystal Clear UV Resin Solar Cure Sunlight Activated Hard UV Resin Kit for Jewelry Making, Casting and Coating DIY Crafts : Beauty & Personal Care 200g, 300g, 400g
Amazon.com: JDiction 1000g UV Resin, New Formula Crystal Clear Ultraviolet Resins Solar Cure Sunlight Activated Hard UV Resin Kit for Jewelry Making, Casting and Coating DIY Crafts : Arts, Crafts & Sewing 1000g

At full strength i'd say it is too thick. It's roughly the same viscosity of a standard 2 part epoxy, which you'd normally spread rather than brush on. I applied 2 coats, trying to avoid making it super thick and was a bit underwhelmed. The big issue being it didn't have good leveling properties unless you really lay it on thick like you would epoxy. Though, you can hit it with a torch to pop any bubbles. Hitting these layers with the light for even 5 seconds made it so that the piece was able to be handled. 30s was typically good and solid and 60s was seemingly a guarantee.

I then found someone in the fly fishing world that was thinning this stuff with alcohol without curing issues. I gave it a whirl and whipped up some 70/30 wiping solution and was pleasantly surprised. It wiped and generally acted exactly like wipe on poly. Except, with these super thin layers you only need 5-10s of curing time with the light and you're ready for another coat.

I tested on birch and pine plywood. I found that neither had adhesion issues. I even whacked it with a hammer to see if it'd crack and flake, but it simply dented with the wood.

It felt about the same as poly when hitting it with sandpaper. However, i was able to press my fingernail into the super thickly applied test piece only 60s after it was applied and it resisted denting.. something you wouldn't dare do to thick poly for closer to a few weeks.

I also applied it over oil-based stain. I was initially going to test applying it over wet and then over dry stain 24h later ... but i found the extra test wasn't even necessary. I applied some stain straight to the birch and also on top of 1h dry prestain conditioner. I then wiped off the stain and immediately applied the 70/30 UV resin to the stained areas. I had no issues with it pulling up or affecting the stain.

It dries completely clear. Here's a comparison of it against a shelf i did a few days ago with the exact same stain and 2 coats of oil minwax poly. The two glossy sections have 4 (or maybe 5?) coats of wipeon. I knocked it down with 320 after the 3rd coat. If i had applied it with a foam brush

Here's the light i was using. I had chosen it since it was usb-C rechargeable, had both wavelengths (though i think only 395 matters), was easy to toggle the power, and easy to wield. It is only 10 watts and it'd be fine for smaller projects or someone willing to spend 5-10 minutes going over a large project. Another thing to keep in mind is that you could just briefly hit it with the light to get it handleable and then move the piece out into the sunlight for an almost-instant cure. The size of light is a personal preference .. but the only thing i can say with certainty is that the $200-700 lights that the woodworking finish companies are selling are completely unnecessary. It cured just fine with my cheap $20 light. Amazon.com: DARKBEAM UV Flashlight 365nm & 395nm Dual Black Light, Blacklight USB Rechargeable LED Ultraviolet Flashlights, Powerful Focusable Woods Lamp Pet Urine Detector, for Uranium Glass, Resin Curing : Tools & Home Improvement

I recorded a video demo of what i've tried so far. I am not a youtuber and was simply holding my phone, but it should give you the gist. I highly encourage real youtubers to invest in some of these jewelry (and maybe 3d printer) resins and give it a more thorough rundown. It truly feels like the woodworking-branded ones are grandly overpriced and need some competition to bring it down to a more reasonable level.

 

I continued some testing today. Not good.

I left the pieces from last night out in the sun for a couple hours just to see if anything would change and give it a confidence cure. I also let the tub of left over mix cure in the sun... and it turned into a very rubbery material. Possibly because their was still unflashed alcohol in the mix? shrug.

I then cured a puddle of 100% resin, 75%, and 50% resin mixtures. Again, the alcohol didn't get a chance to evap. The mixes were a neat rubbery texture, possibly useful for something, but certainly not for wood finish. The 100% was nice and hard, but i could scratch it with my fingernail.

I think this rules out the Jewelry resin as being a candidate for wood finish. It's just not resistant enough to scratching.

I'm curious.. does anyone here use any of the pro finishes (Clean armor, Vesting, Solarez)? Could you do the fingernail scratch test to see if it is just an issue with uv resin in general?

 

The only real benefit I see using that finish is if you want a thick finish quick. There are may other fine finish which would be easier and cheaper.