As someone who plans to take to the water if the worst should ever happen I was thinking about offensive boarding actions. I came to the conclusion that tear gas grenades are the ideal tool for the job being able to effectively debilitate quite quickly someone while very rarely doing lasting damage. Negotiations sometimes fail, your enemy may have sufficient water and food to last a long siege. Most vessels tend to have lots of tight little stairwells and corridors that open up into larger rooms leaving anyone attacking at a serious disadvantage making storming a vessel difficult. Burn a vessel seems excessive, it isn’t a nice way to go and you can’t be certain there aren’t innocent people in there. Plus you’ll probably burn whoever you came to rescue or whatever you came to take if that was your objective. Chemical weapons that someone could potentially make easily don’t tend to be as clean as tear gas, quicklime bombs for example are nasty stuff, they often cause permeate damage to the lungs, throat and eyes, and are potentially lethal. Once again there’s no way of targeting it for specific people so you risk murdering some poor kid. So tear gas grenades are the best option, they can be deployed without risking yourself and you can quickly clear a vessel with minimum risk to innocent people, the vessel and anything within it. Unfortunately they aren’t legal. I’ve seen the spray cans that are legal to use here but I’m more thinking of something you could clear out a room with without exposing yourself. Is there chemical I could legal obtain though reasonably means and deploy by being thrown or quickly deployed though a tube? If someone were to potentially strap a few spray can together with a small quantity of black powder would that create the desired effect? A legal alternative to tear gas would also be useful on land for clearing a small building or maybe a large van as well as on the water.