1 wear away or change the appearance or texture of (something) by long exposure to the atmosphere:
[with object and complement]:
his skin was weathered almost black by his long outdoor life
• [no object] (of rock or other material) be worn away or altered by long exposure to the atmosphere:
the ice sheet preserves specimens that would weather away more quickly in other regions
2 (of a ship) come safely through (a storm):
the sturdy boat had weathered the storm well
• withstand (a difficulty or danger):
this year has tested industry’s ability to weather recession
• Sailing get to the windward of (a cape).
Note that the first definition involves wearing away, and the second relies on a sailing metaphor.
Far better to use withstand to make it explicit that your facades are hard-wearing and not likely to wear away.
Facades withstanding all weathers
I've concentrated on this, because the part of the question asking about whether facade should be plural is General Reference. You are supplying facades, or facade finishes [where facade is an attributive noun, a noun-as-adjective] — that is the finish1 of the facades. The main noun, whichever it is, must be plural.
1 the surface appearance of a manufactured material or object, or the material used to produce this [ODO]