This looks awesome! Can you share the techniques for weathering you used? I got the tools you used but maybe how you used them. I am working on the same costume and did the same Wallmart/Goodwill route so curious to see how you did it. Very good work!
Certe
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I used the wire brush wheel on my grinder to tear up the edges and sleeves on the jacket. This takes a while, just hold the fabric against the wheel until lint shoots up into your face; this lets you know you've worn through the cloth (steer clear of polyesters, as these will melt instead of fraying)
For the rest of it, I cut small slices in the outer layer of the jacket with a box cutter and then went over the area with the grinder. This will tear and fray the cuts to make it tattered and ragged. Be careful; when doing this, because if you get too carried away, you could end up ruining the jacket (this almost happened to me).
I then sponged some brown acrylic paint onto it, using dabbing and wiping motions. I made some splotches of brown along with a general wiping of the entire coat. After the brown, I did the same thing with some black, and alittle green. Make sure to hit the areas around the frays, as this will make them look burned or muddy. This is your time to be creative, so try to add extra color to the areas you think would be the most worn or dirty.
I then mixed some liquid latex with some red acrylic paint and dabbed in on to make blood stains. Make these small, but thick, to get that chunky, congealed look.
Don't overdo the blood, it'll make the costume cheesy:behave.
I then hit the top half of the jacket with some black-colored latex to make shiny burned areas.
If you ever put on too much paint or latex on the frayed areas, you can remove it by taking it to the grinder again.
Major weathering rule- never use anything organic. Real garbage, dirt, and blood might look great, but these will rot and stink; so stick to paint and latex.
Good luck, man!