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You can make "MyCarta" with bondo/Elmer's fiberglass resin or boat builder's epoxy and some sort of material to make your pattern/color and layers. I've done this with denim and various fabrics. It's very simple to make, you just need a way to put pressure on it. I worked from the british blades tutorial the first time, here's the breakdown:
Cut strips of cloth the size you want, allow for trimming edges and whatnot.
Get a sheet of wax kitchen paper ready, you'll layer on this.
Get two sturdy boards and several C-clamps, 2x6 boards will work exceptionally well for this. Plywood will flex fairly easily, if you want to use something like that, double up the thickness.
Get a paint brush or flux brush and some gloves.
Mix your hardener and resin in a container you don't care about. You'll have about 20 minutes to work from the time you mix it.
Lay out one piece of cloth, pour a bit of resin on it and then spread it with the brush, you'll want to be fairly liberal with this but you don't want it oozing everywhere.
Do this with each consecutive layer and then wrap the wax paper around your layers and clamp it between the two boards. If you use bondo type resin it should set up in about one hour. It takes another 24 hours to cure completely, I believe, but you can get the paper off and trim the sides after an hour or so.