diff --git a/steel/init.lua b/steel/init.lua
index b08ff4c..e724c28 100644
--- a/steel/init.lua
+++ b/steel/init.lua
@@ -1,3 +1,4 @@
+dofile(minetest.get_modpath("steel").."/rust.lua")
 
 minetest.register_node("steel:plate_soft", {
 	description = "Soft steel plate",
diff --git a/steel/rust.lua b/steel/rust.lua
new file mode 100644
index 0000000..8b39785
--- /dev/null
+++ b/steel/rust.lua
@@ -0,0 +1,15 @@
+local function moss(input, output)
+	minetest.register_abm({
+		nodenames = {input},
+		neighbors = {"group:water"},
+		interval = 50,
+		chance = 20,
+		action = function(pos)
+			if not minetest.env:find_node_near(pos, 3, output) then
+				minetest.env:add_node(pos, {name=output})
+			end
+		end,
+	})
+end
+
+moss("steel:plate_soft",	"steel:plate_rusted")