What is a good way to strengthen (prevent rips) craft foam?
I spend a lot of time making LARP/Prop weapons and I have a particular sword that has a very weak guard (That's this https://www.instructables.com/id/Ninjato-30-Alt-Z/). I end up fixing it after every rehearsal, because the foam rips (See the pictures and you'll know exactly how that happens). I'm looking for some sort of spray or paint-on substance/concoction that I can use to make this guard stronger. I use foam because it's a bendy substance, so something that will harden and then crack if it is bent is not an option. I want to make the foam tougher, but not stiff or brittle. Anyone have any ideas?