Welcome to Gaia! ::

I wouldn't go the full shop route, since that's expensive. More of a by request, he can do it sort of thing. You're free to commission him on anything as well, so no worries about how to get the seals. =p
Just have Luo tell him what he wants the seals to do and he'll come up with something either from what he knows or from the library. Or, if it doesn't exist, create it.

Well, as a shinobi in your service and a sealing specialist, you can already commission seals from him anyways. Just make it a mission or request or something. Same as you'd ask your assassin ninja to go kill someone.

He did tell you right from the start... Though I suppose he hasn't actually shown any seals he's done yet. You could ask him to do them as a test, to see if he's a qualified sealer and try to place his skill level.

Awesome. May I have a preview of what you're looking for in these commissioned seals too? That way I can begin considering how to create them, or create even better versions now, and give it time to simmer and explode, rather than just thinking it up on the spot then and possibly getting inferior products.

<.<
>.>
Maaaaaaybe?

They sought to prove you could not clean a concrete truck of hardened concrete with dynamite (A practice I know for a fact to be true.), by filling a truck with cement, dumping explosives on top of it, and setting it off. Because it didn't work, they deemed the "Myth" busted. When in fact it did not work, because they used the dynamite WRONG, and put more cement in the barrel than a truck would normally haul in the first place, much less allow to build up.

Edit: They also used the wrong kind of dynamite. I rather forgot to mention that.

They sought to prove you could not cut the barrel off an overheated machine gun with a sword, by putting a gun barrel in a bed of coals until it was red hot, carrying it into another room, spending several minutes attaching it to a mechanism, and then using a powerful mechanical arm to swing a sword at several times the speed and strength a human could achieve, a power the sword was not built to withstand, and deemed it busted because their methods caused the sword to break instead of the no longer hot barrel.

I could most likely go on, but I haven't watched them in a while to see any other instances. However, rest assured, anything they do, while it may look cool, is done for the sake of TV value, and not actual science. They rarely do their experiments properly, and only go for the biggest cinematic bang they can achieve.

~

The fifteen foot instant death radius of a grenade's explosion is the distance the explosion itself reaches. The fire, concussive force, and shrapnel itself are all at their strongest within that point. The severe injury radius just from the shrapnel and concussive force extends much further, to a point I cannot recall, but I believe it is several yards out. Beyond that the shrapnel continues for up to two hundred plus yards, still able to deal significant damage.

Place a shrapnel or fragmentation grenade within fifteen feet of any soft material, such as a body or ballistics gel, and I guarantee it will be completely shredded and unrecognizable after it goes off. If you did not die instantly, you would die within seconds. If by some miracle you survived longer, the kindest thing anyone nearby could do would be to kill you. If it is not instant death, you will wish it was. Thus, if it was not, it should have been.