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Hey, op.
You have to try Rubbered PVC fabric (RPVC), which is the fabric used to build army's zodiac boats. It's a solution cheaper and better than the slime's plastic armor.
Well:
-First, measure the total circumference of your wheels full of air, and the width.
-Second, cut the material. Keep in mind covering the rolling zone only. To give you an idea, the lenght i cut that shit was 2.2 times my wheel's circumference, and the width was about 1' for 2.2' xc tires.
-third, cut the end and begin edges, make them round to avoid self-flating
If you don't have a long rpvc fabric to work with, you can glue a couple of them to reach the length, caring to round edges before gluing.
If the tape is still flating the tubes after that, you can cover the edges with a piece of old tube.
It cant stand against nails and screws, but it protects pretty well against wires, glass, edgy rocks, cactus spines and the shits which are messing your trips. Trust me, even if my english sucks.
Differences between this and slime's plastic shit:
-the the plastic gets dry and breakable after a couple of months, but rpvc is like new even after 2000 km and 3 flats.
-easier to mount than plastic.
-cheap to buy than plastic.
-in the case of a flat on rpvc, the hole of penetration doesn't mean a risk of self-flatting. you cannot say the same in plastic case.
Good luck.