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Quick Seal

Just a small mod that was laying around half-finished, so I finished it xD
It's a just simple block that has the shape of a catwalk plate but cheaper and faster to build.

Additionally it has mount points extending beyond its size which allow it to hold onto edges from neighboring blocks.

Survival ready, construction models and costs 3 steel plates and is built in 3 seconds with the standard welder.
Painting it will spraypaint an X on it, useful to color-code sealed sections.
Leaving it gray will have no visible X paint.