So here is the process i did for my weapon, it's pretty simple
I used expanding foam as the main material for the weapon, it's great because you can carve into it nice and easy, and it's super light so you won't feel like you're carrying too much when 'using' it.
I really enjoyed the carving, though it gets the room super messy *lololololol*
So as you can see from the picture above, there are loads of holes in the expanding foam. You can either fill in every single hole.... or cheat like i did and just cover it up with masking tape.
This creates a nice base for the next few layers, because foam isn't really "glue friendly" and won't stick to as many things as well as masking tape (or painter's tape) does.
During the process of carving, because i'm a super cluts, i over carved some parts or carved them at the wrong angle. Some parts weren't even foamed. So listen as i tell you not to over estimate the foam, and literally cover it ALL!
So to fix my little problem, i used model magic, nice, cheap and easy to use.
It wasn't what i had expected, it has a sort of gummy texture that i'm not too fond of. I thought it would be more like clay where it's blendable and easy to shape, but it tends to shrink a little bit when you stretch it. But it's no big deal really i just dealt with it and filled in all that i could, i just filled it to the point where it's the right shape, i didn't worry about texture or those little details just yet.
Okay, so that is the process of my weapon! I hope you enjoyed and don't forget to comment.
Thanks for reading! :D