C4, metal wall, damage

I did one explosive (c4) for the test. Put it on a metal wall and detonated. After, i put into a free slot metal fragment that would cure, to know how much damage was caused. But it did not work. C4 did not cause any damage?

1 probably didn’t even do enough damage to it.

I thought it was 2 C4 to blow the door completely though?

they are talking about a metal wall not a metal door

Currently you repair metal walls with wood, try it.

2 words, RUST PHYSICS.