wow lotsa effort huh

code/game/objects/items/crayons.dm

@@ -726,13 +726,12 @@
 				to_chat(usr, "<span class='warning'>A color that dark on an object like this? Surely not...</span>")
 				return FALSE
 
-			target.add_atom_colour(paint_color, WASHABLE_COLOUR_PRIORITY)
 
 			if(istype(target, /obj/structure/window))
-				if(color_hex2num(paint_color) < 255)
-					target.set_opacity(255)
-				else
-					target.set_opacity(initial(target.opacity))
+				var/obj/structure/window/W = target
+				W.spraycan_paint(paint_color)
+			else
+				target.add_atom_colour(paint_color, WASHABLE_COLOUR_PRIORITY)
 
 		. = use_charges(user, 2)
 		var/fraction = min(1, . / reagents.maximum_volume)

code/game/objects/items/devices/electrochromatic_kit.dm

@@ -0,0 +1,15 @@
+/obj/item/electronics/electrochromatic_kit
+	name = "electrochromatic kit"
+	desc = "A kit for upgrading a window into an electrochromatic one."
+	icon = 'icons/obj/device.dmi'
+	/// Electrochromatic ID
+	var/id
+
+/obj/item/electronics/electrochromatic_kit/attack_self(mob/user)
+	. = ..()
+	if(.)
+		return
+	var/new_id = input(user, "Set this kit's electrochromatic ID", "Set ID", id) as text|null
+	if(isnull(new_id))
+		return
+	id = new_id